The holiday math trips everyone up. One round pumpkin pie gets you maybe six thin slices. There are twelve people at the table.
So you make two pies. Then three. Now your oven is a pie parking lot and there's still no room for the rolls.
A slab pie fixes all of it. It's the same classic pumpkin pie I've always loved, just spread across a single sheet pan and cut into neat squares. One pan feeds 15 to 20 people, and honestly, it's easier than making a stack of round pies.
The filling is straightforward: pumpkin, eggs, evaporated milk with a splash of half & half, brown sugar, and the usual warm spices. The crust is a big buttery sheet you par-bake so the bottom stays crisp under all that custard.
Best of all, slab pie travels. Cover the pan and it goes straight to the potluck, and the squares are sturdy enough to eat off a napkin. This is my go-to when the guest list gets long.
Why You'll Love This Pumpkin Slab Pie
This is pumpkin pie built for a full house. Same flavor, way more servings, a lot less fuss.
- Feeds a crowd. One half-sheet pan yields 18 to 20 squares, no second pie required.
- Easier than round pies. One crust, one filling, one bake, instead of juggling three pans.
- Neat, portable squares. They hold their shape and travel beautifully to potlucks.
- All the classic flavor. Creamy spiced pumpkin custard on a buttery crust.
Ingredients You'll Need
It's a classic pumpkin pie, just scaled up for the bigger pan.
- Flour (2 ½ cups) + cold butter (1 cup). The base for a flaky homemade crust. Keep the butter COLD.
- Pumpkin puree (two 15-oz cans). Use pure canned pumpkin, NOT pie filling.
- Eggs (4 large). They set the custard across the bigger surface area.
- Evaporated milk (one 12-oz can) + half & half (1 cup). The classic flavor plus a little extra creaminess.
- Granulated sugar (¾ cup) + brown sugar (½ cup). The brown sugar adds a molasses depth I really like here.
- Warm spices. Cinnamon, ginger, nutmeg, and cloves.
- Egg wash (1 egg + water). Brushed on the crust edge for a golden finish.
How to Make Pumpkin Slab Pie
Fit the crust, par-bake, fill, and bake. The steps are simple, they just cover more real estate than a round pie.
Step 1: Make and fit the crust
Make your dough and roll it out large enough to line a rimmed half-sheet pan, about 13x18 inches, coming up the sides. Press it into the corners and crimp the top edge. Chill it while the oven heats.
Step 2: Par-bake the crust
Line the crust with parchment and pie weights and par-bake at 400°F for about 15 minutes. This sets the bottom so it stays crisp under the filling. Don't skip it.
Step 3: Whisk the filling
Whisk the pumpkin puree, eggs, evaporated milk, half & half, both sugars, the spices, and salt until smooth. It'll be a large, pourable custard.
Step 4: Fill and bake
Pour the filling into the par-baked crust and brush the crust edge with egg wash. Bake at 350°F for 40-50 minutes, until the edges are set and the center still has a slight jiggle.
Step 5: Cool and cut
Cool the slab pie completely in the pan, then cut into squares. A fully cooled pie cuts clean; a warm one tears.
The Best Pan for a Slab Pie
The pan is what makes it a slab pie, so this part matters.
- Rimmed half-sheet pan. About 13x18 inches. The rim is what holds all that custard in.
- Jelly-roll pan. A 10x15-inch jelly-roll pan works too for a slightly thicker slab.
- Grease or line it. A light coat of butter or a parchment sling makes lifting and cutting squares easy.
Recipe Tips
A few things keep this from going sideways across the bigger pan.
- Par-bake the crust. The single best move against a soggy bottom under a wide, wet filling.
- Store-bought crust shortcut. Unroll two or three refrigerated pie crusts, press the seams together, and patch to line the pan.
- Watch the jiggle. Pull it when the center still wobbles slightly. It finishes setting as it cools and won't crack.
- Cool before cutting. Wipe the knife between cuts and trim the outer edge for clean, uniform squares.
Apple fans get the same sheet-pan approach in these apple pie bars.
Storage and Make-Ahead
Slab pie keeps well, which makes it a great holiday planner.
- Refrigerator. Cover and keep for 3 to 4 days.
- Make ahead. Bake it a day early, chill, and cut just before serving.
- Freezer. Freeze cut squares, well wrapped, up to 1 month. Thaw in the fridge.
What to Serve With Pumpkin Slab Pie
Keep the toppings classic and let the squares shine.
- Whipped cream. A dollop on each square, plain or spiked with a little maple.
- Vanilla ice cream. A small scoop turns it into a proper dessert plate.
- Coffee or spiced cider. The perfect warm drink alongside.
Want it even more portable? My pumpkin pie bars.
Recipe
Pumpkin Slab Pie
Ingredients
For the Crust
- 2 ½ cups all-purpose flour
- 1 cup cold unsalted butter cubed
- 1 teaspoon salt
- 6-8 tablespoons ice water added gradually
For the Pumpkin Filling
- 2 cans (15 oz each) pure pumpkin puree not pumpkin pie filling
- 4 large eggs
- 1 can (12 oz) evaporated milk
- 1 cup half & half
- ¾ cup granulated sugar
- ½ cup light brown sugar packed
- 2 teaspoons ground cinnamon
- 1 teaspoon ground ginger
- ½ teaspoon ground nutmeg
- ½ teaspoon ground cloves
- 1 teaspoon salt
For the Egg Wash
- 1 egg beaten
- 1 tablespoon water
Instructions
Make the Crust
- Make the dough and roll it out large enough to line a rimmed half-sheet pan (about 13x18 inches), coming up the sides. Press into the corners and crimp the top edge. Chill while the oven heats.
Par-Bake
- Line the crust with parchment and pie weights. Par-bake at 400°F for about 15 minutes to set the bottom, then remove the weights.
Make the Filling and Bake
- Whisk the pumpkin, eggs, evaporated milk, half & half, both sugars, spices, and salt until smooth.
- Pour the filling into the par-baked crust and brush the crust edge with egg wash. Bake at 350°F for 40 to 50 minutes, until the edges are set and the center still jiggles slightly.
- Cool the slab pie completely in the pan, then cut into squares.
Notes
- Par-bake: Don't skip it; it keeps the wide crust from going soggy.
- Shortcut crust: Press together 2 to 3 refrigerated pie crusts to line the pan.
- Clean squares: Cool fully, wipe the knife between cuts, and trim the outer edge.
- Make ahead: Bake a day early. Keeps 3 to 4 days refrigerated, or freeze squares up to 1 month.
