A sweet potato pie milkshake should be thick enough that a straw stands up in it on its own.
That's the bar.
Anything thinner is a smoothie wearing a costume, and there are already plenty of those.
I found this out the hard way last November, standing in my kitchen at eleven at night with a blender full of something the consistency of thin eggnog.
The problem was that I'd built it like a health drink: sweet potato, milk, ice, a little maple syrup.
All the flavor, none of the body.
The fix was obvious once I stopped avoiding it.
Vanilla ice cream. A lot of it.
Real ice cream is what makes a milkshake a milkshake, and cooked sweet potato blended into it turns the whole glass into pie filling.
Cinnamon and nutmeg together, not just cinnamon, which is where most versions stop short.
It takes five minutes if your sweet potato is already cooked.
Whipped cream on top, crushed graham crackers over that, and it eats like a slice of pie you can drink.
My wife had one and asked me to make a second before she'd finished the first.
What You Need for a Sweet Potato Pie Milkshake
Six ingredients and a blender. The ratio between the ice cream and the milk is the only thing you really have to get right.
- Cooked sweet potato (1 cup, cooled). Cold sweet potato straight from the fridge is best, since anything warm melts the ice cream on contact.
- Vanilla ice cream (1 ½ cups). The backbone of the whole drink. Use a real dairy vanilla, not a low-fat frozen dessert, because the fat is doing structural work here.
- Whole milk (½ cup). Just enough to get the blender moving. Start with less than you think.
- Cinnamon (½ teaspoon). The obvious half of the pie flavor.
- Nutmeg (¼ teaspoon). The half almost everybody forgets. Skip it and this tastes like a spiced sweet potato drink instead of pie.
- Vanilla extract (½ teaspoon). A small addition that ties the spices to the ice cream.
For the top: whipped cream and crushed graham crackers.
How to Cook Sweet Potato for a Milkshake
Roast it if you have the time, boil it if you don't. Either way it has to be completely cool before it goes anywhere near the blender.
Roasting (best flavor)
Prick a medium sweet potato all over and roast at 400°F for 45 to 55 minutes, until the skin wrinkles and a knife meets no resistance.
Roasting drives off water and concentrates the sugar, and you can taste the difference in the finished shake.
Boiling (fastest)
Peel, cube, and boil for 12 to 15 minutes until fork-tender, then drain well and let the warmth escape for a few minutes.
Drain it thoroughly. Extra water is the enemy of a thick shake.
The Part Everybody Rushes
Cool the sweet potato completely, then refrigerate it for at least an hour.
Pro tip: I cook two sweet potatoes at once and keep the mash in the fridge in a lidded container. Then a shake is a five-minute decision instead of an hour-long project.
How to Make Sweet Potato Pie Milkshake
Order of operations matters more than anything else in this recipe. Liquids first, ice cream last, and blend for as little time as you can get away with.
Step 1: Load the Blender
Add the whole milk, cold sweet potato, cinnamon, nutmeg, and vanilla to the blender jar.
Pulse a few times to break up the sweet potato before the ice cream goes in.
This little step is why my shakes stopped having orange lumps in them.
Step 2: Add the Ice Cream
Scoop the vanilla ice cream on top of the mixture.
Let it sit on the counter 2 to 3 minutes if it came out rock-hard, just enough to soften the edges.
Step 3: Blend Briefly
Blend on low, then medium, for 20 to 30 seconds, only until it's smooth.
The instant it looks uniform, stop.
Every extra second of blending is friction, and friction is melting your ice cream into milk.
Step 4: Check and Adjust
Too thick to move? Add milk 1 tablespoon at a time.
Too thin? Add another scoop of ice cream and pulse twice.
Pour into a tall glass, top with whipped cream and crushed graham crackers, and drink it immediately.
Tips for the Thickest, Creamiest Shake
- Chill the glass. Ten minutes in the freezer before you pour. It buys you several extra minutes of thickness.
- Cold sweet potato, always. Room-temperature mash melts the ice cream during blending and you can't undo it.
- Under-blend on purpose. A shake that's almost smooth is thicker than a shake that's perfectly smooth. Nobody ever complains about a slightly textured milkshake.
- Add liquid last, never first. You can always add more milk. You cannot take it back out.
- NEVER use ice. Ice makes it colder and thinner and it waters down the pie flavor. Ice cream is your thickener.
- Frozen banana for extra body. Half a frozen banana thickens things considerably. It does add its own flavor, so it's a trade rather than a free upgrade.
Topping Ideas
Every topping here is borrowed from an actual slice of sweet potato pie. That's the point.
- Whipped cream. Real cream, whipped soft, piled on. The canned stuff collapses in about a minute.
- Crushed graham crackers. This is the crust, and it's the topping that makes people say "oh, that's clever."
- A dusting of cinnamon. Over the whipped cream, right before serving.
- Caramel drizzle. Run it down the inside of the glass before you pour for the diner look.
- Toasted pecans. Chopped fine so they sit on the cream instead of sinking straight through.
- Marshmallow fluff. The sweet potato casserole angle, for the crowd that grew up with marshmallows on theirs.
Frequently Asked Questions
What ingredients are in a sweet potato pie milkshake?
Cooked sweet potato, vanilla ice cream, whole milk, cinnamon, nutmeg, and vanilla extract. That's the whole list. The ice cream is what separates this from a sweet potato smoothie, and the nutmeg alongside the cinnamon is what makes it read as pie rather than just spiced sweet potato. Whipped cream and crushed graham crackers on top are optional but they finish the idea.
Can I make this without an ice cream maker or blender attachment?
You don't need either one. This is a standard blender recipe, and a $30 countertop blender handles it fine. No ice cream maker is involved anywhere, since you're using store-bought vanilla ice cream. An immersion blender in a tall jar works too, though you'll need to soften the ice cream a bit more first.
Can I use canned sweet potato puree?
Yes. Use plain unsweetened puree rather than canned pie filling, drain any liquid off the top, and chill it before blending. Roasted fresh sweet potato has deeper flavor, but canned puree makes this a genuine five-minute recipe and it's what I reach for on a weeknight.
How do I make it extra thick, milkshake-style?
Three levers. Use more ice cream and less milk, start with ¼ cup of milk instead of a half and add from there. Make sure the sweet potato is refrigerator-cold. And blend for the shortest time that gets it smooth, because extended blending generates heat and melts your structure. A frozen half banana is the fourth option if you want it truly spoonable.
Can I make this dairy-free?
You can swap in a coconut or oat vanilla frozen dessert and the matching non-dairy milk, and the spice and sweet potato still carry it. The texture won't be quite as rich, since dairy fat is doing real work in a milkshake. The version I make and the one I'd recommend uses real ice cream and whole milk.
What toppings go well on a sweet potato pie milkshake?
Whipped cream and crushed graham crackers are the classic pairing, straight off a slice of pie. Beyond that, a dusting of cinnamon, a caramel drizzle down the inside of the glass, finely chopped toasted pecans, or a spoonful of marshmallow fluff if you're in the sweet potato casserole camp.
Is this the same as a sweet potato smoothie?
No, and the difference is the whole reason this recipe exists. A sweet potato smoothie is built on milk and ice, sometimes with protein powder or flaxseed, and it comes out thin and drinkable. This is built on vanilla ice cream, so it's thick, rich, and unapologetically a dessert. Same vegetable, completely different drink.
Recipe
Sweet Potato Pie Milkshake
Ingredients
For the Milkshake
- 1 cup cooked sweet potato peeled, mashed, and chilled
- 1 ½ cups vanilla ice cream full-fat
- ½ cup whole milk plus more as needed
- ½ teaspoon ground cinnamon
- ¼ teaspoon ground nutmeg
- ½ teaspoon vanilla extract
For Topping
- whipped cream
- 2 tablespoons graham crackers crushed
Instructions
Cook the Sweet Potato
- Prick a medium sweet potato all over and roast at 400F for 45 to 55 minutes, until the skin wrinkles and a knife meets no resistance. To go faster, peel, cube, and boil for 12 to 15 minutes until fork-tender, then drain thoroughly.
- Peel and mash the sweet potato, cool it completely, then refrigerate at least 1 hour. Measure out 1 cup.
Blend the Shake
- Add the whole milk, chilled sweet potato, cinnamon, nutmeg, and vanilla to the blender jar. Pulse a few times to break up the sweet potato.
- Scoop the vanilla ice cream on top. If it is rock-hard, let it soften on the counter for 2 to 3 minutes first.
- Blend on low, then medium, for 20 to 30 seconds, only until smooth. Stop as soon as it looks uniform, since extended blending melts the ice cream.
- Adjust the consistency: add milk 1 tablespoon at a time if it is too thick, or another scoop of ice cream and two pulses if it is too thin.
- Pour into a chilled tall glass, top with whipped cream and crushed graham crackers, and serve right away.
Notes
- Chill everything: A cold glass and refrigerator-cold sweet potato are the two easiest ways to keep the shake thick.
- No ice: Ice thins the shake and dilutes the pie flavor. The ice cream is the thickener.
- Canned puree: Plain unsweetened sweet potato puree works, not canned pie filling. Drain off any standing liquid and chill before blending.
- Extra thick: Start with ¼ cup of milk instead of ½ cup, or blend in half a frozen banana.
- Make ahead: Cook and mash two sweet potatoes at once and keep the mash refrigerated up to 4 days so the shake is a five-minute job.
