I buy sweet potatoes five at a time now, which is about four more than any single dinner needs.
It started as a roasting habit in October and quietly took over the rest of my fall baking.
Muffins first. Then a loaf. Then a pan of bars that disappeared before it fully cooled.
My wife has started asking whether anything in the kitchen is safe from it.
The answer is no, and these blondies are why.
A cup of cooled sweet potato puree does something to a blondie that no amount of extra butter can.
It keeps the middle moist and slightly dense, so you get real chew instead of the dry, crumbly square most blondie recipes hand you by day two.
The spices are cinnamon, nutmeg, and a small amount of ginger, warm enough to notice without turning the whole thing into a pumpkin pie.
Brown sugar and melted butter do the rest of the work.
The maple glaze is where I stopped tinkering.
It is powdered sugar and real maple syrup whisked in a small bowl, spread thin over the cooled slab, left to set for twenty minutes.
Thin is the whole point. Any thicker and it stops being a finish and starts being frosting.
One bowl, one pan, one whisk of glaze. That is the entire commitment!
Why You'll Love These Blondies
This is a one-bowl recipe with a two-ingredient glaze. The hardest part is waiting for the sweet potato to cool.
- Genuinely chewy, not cakey. Melted butter, a single egg, and just enough leavening to lift them. No creaming, no whipping, no air.
- Real sweet potato flavor. A full cup of puree, which is what makes them taste like something rather than just sweet.
- Pantry ingredients. Flour, brown sugar, butter, an egg, and spices you already own.
- That thin maple glaze. Two ingredients, thirty seconds, and it makes the whole pan look like it came from a bakery case.
- Endlessly adaptable. Chocolate chips, chopped pecans, or nothing at all. They work every way.
Ingredients You'll Need
Everything splits into three short lists. Dry, wet, and glaze, in that order.
Dry ingredients
- All-purpose flour (1 ¼ cups). Spoon it into the measuring cup and level it with a knife. Scooping straight from the bag packs in an extra ounce and that is what turns blondies dry.
- Baking powder (1 tsp) and baking soda (¼ tsp). Just enough lift to keep them from being solid fudge.
- Salt (½ tsp). Sharpens the brown sugar.
- Cinnamon (¾ tsp), nutmeg (½ tsp), ground ginger (¼ tsp). Freshly grated nutmeg if you have a whole one sitting in the cupboard. It is noticeably better here.
Wet ingredients
- Unsalted butter, melted (½ cup). Melted is the whole texture strategy. Softened and creamed butter gives you a cakey bar.
- Light brown sugar (1 cup), packed. Brown sugar holds moisture, and moisture is chew.
- Egg (1 large). Room temperature. One egg only, since two make them rise into cake.
- Vanilla extract (1 tsp).
- Sweet potato puree (1 cup), cooled. This must be cool to the touch before it goes anywhere near the melted butter.
- Chocolate chips (½ cup), optional. Semi-sweet is my pick against all that brown sugar.
Maple glaze
- Powdered sugar (½ cup). Sift it if the box has been open a while.
- Real maple syrup (2 to 3 tsp). Real syrup, not pancake syrup. There are only two ingredients here, so one of them cannot be fake.
- Milk (1 tsp), as needed. Only to thin the glaze if it is too stiff to spread.
How to Roast (or Microwave) the Sweet Potato
Roasting tastes better. Microwaving takes twelve minutes. I do both depending on how much of the evening I have left.
The oven method
Heat the oven to 400°F, poke a medium sweet potato all over with a fork, and set it on a foil-lined sheet.
Roast 45 to 55 minutes, until a knife slides in with no resistance and the skin is loose.
The dry heat drives off water and concentrates the sugars, which is exactly what you want in a bar.
The microwave shortcut
Poke the sweet potato, wrap it in a damp paper towel, and microwave on high for 5 minutes.
Flip it and go another 4 to 6 minutes, until it gives easily when squeezed.
Pro tip: a microwaved sweet potato holds more water than a roasted one. Mash it, then let it sit in a fine mesh strainer for 10 minutes so the extra liquid drains off.
Either way, scoop the flesh out, mash it smooth, measure 1 cup, and let it cool completely.
How to Make Sweet Potato Blondies
Step 1: Prep the pan
Heat the oven to 350°F.
Line a 9x9 pan with parchment, leaving overhang on two sides, and give it a light coat of cooking spray.
Step 2: Whisk the dry ingredients
In a medium bowl, whisk the flour, baking powder, baking soda, salt, cinnamon, nutmeg, and ginger.
Thirty seconds of whisking distributes the leavening better than any amount of stirring later.
Step 3: Mix the wet ingredients
In a large bowl, stir the melted butter and brown sugar until they look like wet sand.
Add the egg and vanilla and stir until smooth.
Stir in the cooled sweet potato puree.
Step 4: Combine
Add the dry ingredients to the wet and fold with a spatula until the last streak of flour disappears.
The batter will be thick and a little stubborn. That is correct.
Fold in the chocolate chips now if you are using them.
Step 5: Bake
Spread the batter into the pan and smooth the top with the back of a spoon.
Bake 28 to 32 minutes, until the edges pull slightly from the parchment and a toothpick in the center comes out with a few moist crumbs.
Cool in the pan on a rack for 15 minutes, then lift the slab out by the parchment and cool it completely before glazing.
How to Make the Maple Glaze
The glaze takes about thirty seconds. Make it only after the blondies are fully cool, since a warm slab melts it into a sticky mess.
Whisk the powdered sugar and maple syrup together until smooth and thick, like slow honey.
Add milk ½ teaspoon at a time only if it will not spread.
Spread it thin across the top with the back of a spoon or a small offset spatula.
Let it set for 20 minutes before cutting.
Want a thicker glaze? Add powdered sugar a tablespoon at a time until it holds a ribbon.
Tips for Chewy, Not Cakey, Blondies
- Underbake slightly. Pull them when the toothpick has moist crumbs on it. A clean toothpick means you already went too far.
- Cool the sweet potato completely. Warm puree partly cooks the egg and loosens the batter, and a loose batter bakes up cakey.
- Measure the flour properly. Spoon and level. This single habit fixes more dry bars than any other change.
- Do not beat the batter. Fold with a spatula, stop at the last flour streak. Beaten batter builds gluten and turns bready.
- Melted butter only. NEVER cream softened butter for these. Creaming whips in air, and air makes cake.
- Let them cool before cutting. Warm blondies tear along the edges and the glaze slides right off.
Variations
- Gluten-free. Swap the all-purpose flour for a measure-for-measure gluten-free blend that already contains xanthan gum. Add 5 extra minutes to the bake and check the center.
- Plant-based swap. Use a plant butter and replace the egg with 3 tablespoons of non-dairy milk plus 1 tablespoon of ground flaxseed. The texture goes a touch softer and less chewy, but it holds together fine.
- Tahini blondies. Replace 2 tablespoons of the melted butter with tahini for a nutty, slightly savory edge that plays well against the maple.
- Pecan crunch. Fold in ½ cup of toasted chopped pecans instead of the chocolate chips.
- Purple sweet potato. Works with no changes to the recipe and turns out a striking lavender-gray crumb. The flavor is a bit drier and less sweet, so bump the glaze up by a teaspoon of maple.
- Extra spice. Swap all three spices for 1 ½ teaspoons of pumpkin pie spice if that jar is already open.
Storing and Freezing
- Counter. Airtight at room temperature for 2 days. They are at their chewiest on day one and day two.
- Refrigerator. Up to 1 week in a sealed container. Let a square sit out for 15 minutes before eating, since cold firms them up.
- Freezer. Up to 3 months. I freeze them unglazed, wrapped individually, and glaze after thawing so the top stays neat.
- Thawing. Overnight in the fridge or about 1 hour on the counter.
Frequently Asked Questions
Can I make sweet potato blondies gluten-free?
Yes. Use a measure-for-measure gluten-free flour blend that includes xanthan gum, swapped one for one with the all-purpose flour. The batter will look slightly wetter going into the pan and the bake runs about 5 minutes longer. Check the center with a toothpick rather than trusting the clock.
Can I make these without eggs and dairy?
You can get close. Use a plant butter in place of the dairy butter and replace the egg with a flax egg, which is 1 tablespoon of ground flaxseed whisked into 3 tablespoons of non-dairy milk and left to thicken for 10 minutes. The result is a little softer and less chewy than the original, but it bakes and slices without falling apart. Use non-dairy milk in the glaze as well.
What is the fastest way to prep the sweet potato?
The microwave. Poke it, wrap it in a damp paper towel, and cook on high for 5 minutes, then flip and go another 4 to 6 minutes. Mash the flesh and let it drain in a fine mesh strainer for 10 minutes, since microwaved sweet potato holds more water than roasted. Total time is about 20 minutes including cooling instead of an hour.
Why are my blondies cakey instead of chewy?
Usually one of three things. Too much flour from scooping the measuring cup straight through the bag, creamed butter instead of melted, or an extra egg. All three add lift and structure that a blondie is not supposed to have. Spoon and level the flour, melt the butter, and stick to one egg.
Can I use canned sweet potato puree or pumpkin puree instead?
Both work. Use plain canned sweet potato puree, not candied yams packed in syrup, and blot it with a paper towel if it looks wet. Canned pumpkin puree substitutes cup for cup and gives a slightly earthier, less sweet bar, so I add an extra tablespoon of brown sugar when I go that route.
How do I store sweet potato blondies, and can I freeze them?
Airtight on the counter for 2 days, in the fridge for up to a week, or in the freezer for up to 3 months. For freezing, I skip the glaze, wrap the squares individually, and glaze them after thawing so the top does not go sticky.
Can I skip the glaze?
Absolutely. They are good plain, and skipping it makes them noticeably less sweet, which some people prefer. If you skip the glaze, I would fold in the chocolate chips so there is still something happening on top.
Recipe
Sweet Potato Blondies
Ingredients
For the Blondies
- 1 ¼ cups all-purpose flour spooned and leveled
- 1 teaspoon baking powder
- ¼ teaspoon baking soda
- ½ teaspoon salt
- ¾ teaspoon ground cinnamon
- ½ teaspoon ground nutmeg freshly grated if possible
- ¼ teaspoon ground ginger
- ½ cup unsalted butter melted
- 1 cup light brown sugar packed
- 1 large egg room temperature
- 1 teaspoon vanilla extract
- 1 cup sweet potato puree cooled completely
- ½ cup semi-sweet chocolate chips optional
For the Maple Glaze
- ½ cup powdered sugar sifted
- 2-3 teaspoon real maple syrup
- 1 teaspoon milk as needed to thin
Instructions
Prep the Sweet Potato
- Poke a medium sweet potato all over with a fork and roast at 400F for 45 to 55 minutes, until a knife slides in with no resistance. For a shortcut, wrap it in a damp paper towel and microwave on high 5 minutes, flip, and go 4 to 6 minutes more.
- Scoop out the flesh, mash it smooth, and measure 1 cup. If it was microwaved, let it drain in a fine mesh strainer for 10 minutes. Cool completely before using.
Make the Blondies
- Heat the oven to 350F. Line a 9x9-inch pan with parchment paper, leaving overhang on two sides, and coat lightly with cooking spray.
- In a medium bowl, whisk the flour, baking powder, baking soda, salt, cinnamon, nutmeg, and ginger for about 30 seconds.
- In a large bowl, stir the melted butter and brown sugar until the mixture looks like wet sand. Stir in the egg and vanilla until smooth, then stir in the cooled sweet potato puree.
- Fold the dry ingredients into the wet with a spatula, stopping as soon as the last streak of flour disappears. The batter will be thick. Fold in the chocolate chips if using.
- Spread the batter into the pan and smooth the top. Bake 28 to 32 minutes, until the edges pull slightly from the parchment and a toothpick in the center comes out with a few moist crumbs.
- Cool in the pan on a wire rack for 15 minutes, then lift out by the parchment and cool completely.
Glaze and Serve
- Whisk the powdered sugar and maple syrup until smooth and thick, adding milk ½ teaspoon at a time only if it will not spread.
- Spread the glaze thin over the fully cooled slab and let it set for 20 minutes before cutting into 12 squares.
Notes
- Cool the puree: warm sweet potato loosens the batter and bakes up cakey instead of chewy.
- Spoon and level the flour: scooping straight from the bag packs in extra flour and dries the bars out.
- Melted butter only: creaming softened butter whips in air and turns these into cake.
- Underbake slightly: pull them when the toothpick shows moist crumbs, not when it comes out clean.
- Storage: airtight on the counter 2 days, fridge up to 1 week, or freezer up to 3 months (freeze unglazed).
