Apple Slab Pie with Crumble Topping
This Apple Slab Pie with Crumble Topping stretches classic apple pie into a big buttery sheet, piled with cinnamon apples and a crunchy oat crumble. It is the easiest way to feed a crowd this fall.
Why This Apple Slab Pie Is Made for Fall Gatherings
There is a reason apple slab pie shows up at every potluck, bake sale, and Thanksgiving table once the weather turns crisp. It takes everything you love about a classic apple pie, warm cinnamon apples tucked into a buttery crust, and stretches it into a big sheet pan that feeds a crowd without the fuss of crimping a round pie edge. If you have ever searched for easy apple pie crust ideas or recipes with pie filling that actually deliver on flavor, this is the one to save.
Think of this as apple crisp with pie crust: a flaky, tender base holds a mountain of spiced apples, and instead of a top crust, it gets buried under a crunchy oat crumble that turns golden and craggy in the oven. It is one of those fall pies recipes easy enough for a weeknight, yet impressive enough for a holiday spread.
Before we get cooking, the right tools and ingredients make a real difference here. A sturdy rimmed baking sheet keeps the juices from spilling into your oven, and a good pastry cutter makes quick work of that crumble topping. These are the products that genuinely help this recipe shine:
Choosing the Best Apples for Slab Pie
Not all apples behave the same way in the oven, and that matters a lot for apple and pie crust recipes like this one. You want a mix of textures and flavors:
- Granny Smith apples bring tartness and hold their shape, so your filling does not turn to mush.
- Honeycrisp or Braeburn apples add natural sweetness and a bit of juiciness.
- Avoid apples like Red Delicious, which tend to break down too much and turn watery.
Slicing the apples thin and even, about a quarter inch, helps them cook through at the same rate as the crust underneath.
Chef's Tip: Toss your sliced apples with the lemon juice as soon as you cut them. It keeps them from browning while you prep everything else, and it brightens the whole filling.
Building the Layers: Crust, Filling, and Crumble
This recipe leans on a few smart shortcuts that make it one of the easiest homemade apple desserts you will bake this season. Two refrigerated pie crusts pressed together form the base, so there is no need to make dough from scratch, though your favorite one crust apple pie recipe will work perfectly if you prefer homemade.
The filling is simple: apples, sugar, a touch of flour to thicken the juices, warm spices, and that squeeze of lemon. The crumble topping, made from butter, oats, flour, and both sugars, is what really sets this apart from a typical apple tart with pie crust. It adds crunch and richness without the extra step of rolling out a second crust.
Chef's Tip: Keep your butter cold right up until you cut it into the crumble mixture. Cold butter is what creates those satisfying, craggy clusters on top instead of a flat, sandy layer.
Ready to make it? Here is the full step-by-step recipe:
Apple Slab Pie with Crumble Topping
This Apple Slab Pie with Crumble Topping stretches classic apple pie into a big buttery sheet, piled with cinnamon apples and a crunchy oat crumble. It is the easiest way to feed a crowd this fall.
Ingredients
- 2 refrigerated pie crusts, store-bought or homemade, one crust apple pie dough works well here, brought to room temperature
- 8 cups apples, peeled, cored, and thinly sliced, a mix of Granny Smith and Honeycrisp
- 3/4 cup granulated sugar, divided
- 1/2 cup light brown sugar, packed, divided between filling and crumble
- 3/8 cup all-purpose flour, for the filling, plus 1 cup more for the crumble topping
- 2 tsp ground cinnamon
- 1/4 tsp ground nutmeg, freshly grated if possible
- 1 tbsp lemon juice, freshly squeezed
- 1/2 tsp salt, divided
- 1 cup old-fashioned rolled oats, for the crumble topping
- 3/4 cup unsalted butter, cold, cubed, for the crumble
- 1 large egg, beaten, for egg wash
- 1 vanilla ice cream, optional, for serving
Instruction
Preheat the oven to 400 degrees F (200 degrees C). Line a 10x15 inch rimmed baking sheet with parchment paper, leaving a slight overhang on the sides.
Unroll or roll out both pie crusts and gently press them together into one large rectangle to fit the bottom of the baking sheet, patching any gaps with your fingers. Press the dough up the sides slightly to form a small lip.
In a large bowl, toss the sliced apples with 1/2 cup granulated sugar, 1/4 cup brown sugar, 1/3 cup flour, cinnamon, nutmeg, lemon juice, and 1/4 teaspoon salt until evenly coated.
Spread the apple mixture evenly over the crust in the baking sheet, mounding it slightly since it will shrink as it bakes.
In a separate bowl, combine the remaining flour, remaining brown sugar, remaining granulated sugar, oats, and remaining salt. Cut in the cold butter with your fingers or a pastry cutter until the mixture forms coarse, pea-sized crumbs.
Scatter the crumble topping evenly over the apples, pressing down gently so it holds together in clusters.
Brush any exposed edges of the crust with the beaten egg for a golden finish.
Bake for 40 to 45 minutes, until the topping is deep golden brown and the apple filling is bubbling at the edges. Tent loosely with foil if the top browns too quickly.
Cool on a wire rack for at least 1 hour before slicing into squares. This helps the filling set so your slices hold together.
Serve warm or at room temperature, with a scoop of vanilla ice cream if desired.
Equipment
- 10x15 inch rimmed baking sheet
- Parchment paper
- Rolling pin
- Pastry cutter or fork
- Large mixing bowls
- Wire cooling rack
Notes
Serving, Storing, and Make-Ahead Tips
Let the slab pie cool for a full hour before slicing. I know it is tempting to dig in right away, but that resting time lets the filling set so your squares hold together instead of sliding apart. Serve it warm with a scoop of vanilla ice cream, or at room temperature with a dusting of powdered sugar.
For storage, keep leftovers loosely covered at room temperature for up to two days, or refrigerate for up to five. A quick reheat in the oven brings the crumble back to life far better than a microwave ever could.
This recipe also freezes well. Wrap cooled squares individually and freeze for up to two months, then thaw overnight in the fridge before reheating. However you serve it, this apple slab pie is proof that some of the best fall desserts are also the easiest ones to pull off.
