Apple slab pie is the pie I make for crust people. It is thinner than a round pie, baked in a 10x15-inch jelly roll pan, and every square has a generous amount of flaky pastry.
I think of it as a giant apple toaster pastry with real fruit and maple icing. It serves 18 without the drama of cutting the first wedge from a deep pie.
The dough is the main project, so I make it ahead when I can. Once the discs are cold, the filling is just chopped apples, sugar, flour, lemon, vanilla, and spices.
Why I keep coming back to this
- It keeps the main apple flavor clear instead of hiding it under too many extras.
- The method is practical for a home kitchen, with clear stopping points if I need to pause.
- The texture has contrast, whether that means flaky crust, soft cake, crisp pastry, or a chilled sip.
- Most of the ingredients are easy to recognize and measure.
- It is flexible enough for a small tweak without losing the point of the recipe.
- Leftovers, when there are any, still feel worth saving.
What you need (and what each one is doing)
- 4 cups all-purpose flour (500g).This thickens or structures the recipe.
- 1 1/2 teaspoons salt.
- 1 teaspoon granulated sugar.I measure it instead of guessing.
- 1 3/4 cups unsalted butter, cold and cubed (396g).This brings tenderness and richness. I pay attention to whether it should be melted, softened, or cold because that changes the final texture.
- 3/4 cup ice water (180ml).
- 1 large egg, lightly beaten with 1 Tablespoon milk, for egg wash (15ml milk).Eggs bind, enrich, or brown depending on the step. I use room temperature eggs in batter and a light hand with egg wash.
- optional: coarse sugar for sprinkling on top.I measure it instead of guessing.
- 10 cups peeled and chopped apples (about 4-5 lbs).The apples are the main flavor. I cut them as evenly as I can so the pieces soften at the same pace and the finished slab pie does not have hard bites.
- 2/3 cup granulated sugar (135g).I measure it instead of guessing.
- 1/4 cup all-purpose flour (31g).This thickens or structures the recipe.
- 2 Tablespoons fresh lemon juice (30ml).This carries the apple flavor. I use a cider or juice I would drink cold because the flavor concentrates as it rests.
- 1 teaspoon pure vanilla extract.
- 1 1/2 teaspoons ground cinnamon.The spice is small but noticeable.
- 1/4 teaspoon ground cloves.The spice is small but noticeable.
- 1/4 teaspoon ground nutmeg.The spice is small but noticeable.
- 3/4 cup confectioners' sugar (90g).I measure it instead of guessing.
- 2 Tablespoons pure maple syrup (30ml).
- enough milk or heavy cream to thin (a couple teaspoons).Dairy adjusts moisture and texture. I add it as written because a small change can make frosting loose or cake batter too thick.
How I make it
Step 1 — Make dough
Mix flour, salt, and sugar. Cut in cold butter, then add ice water 1 Tablespoon at a time until clumps form. Divide, flatten, wrap, and chill at least 2 hours.
Step 2 — Mix filling
Stir apples, sugar, flour, lemon juice, vanilla, cinnamon, cloves, and nutmeg in a large bowl.
Step 3 — Roll bottom crust
Preheat to 375°F (190°C). Roll one disc to about 18x13 inches and fit it into a 10x15-inch jelly roll pan with overhang.
Step 4 — Top pie
Spread filling over crust. Roll the second disc, cover the apples, fold and seal the overhang, crimp with a fork, cut vents, brush with egg wash, and sprinkle with coarse sugar.
Step 5 — Bake and cool
Bake 40-46 minutes until golden and bubbling. Cool on a wire rack for a few hours.
Step 6 — Ice and slice
Whisk confectioners' sugar, maple syrup, and enough milk or cream to drizzle. Drizzle over pie and cut into squares.
Tips from my kitchen
- Measure before starting.I set out the small ingredients first because pastry, batter, and hot sugar all punish last-minute searching.
- Trust the visual cues.Ovens vary, so I look for bubbling fruit, golden pastry, set centers, or thickened frosting instead of blindly following the timer.
- Give it the rest it needs.Cooling is not dead time; it is when filling thickens, crumb sets, and frosting becomes easier to handle.
- Keep edges tidy.Clean borders on pastry and evenly spread batter make the finished recipe easier to slice or serve.
Variations I have actually tried
- Skip icing and serve with whipped cream.:Skip icing and serve with whipped cream.
- Use salted caramel instead of maple icing.:Use salted caramel instead of maple icing.
- Replace 2 cups apples with firm pears.:Replace 2 cups apples with firm pears.
- Cut small dough shapes from scraps for the top.:Cut small dough shapes from scraps for the top.
- Add a few drops maple extract if the syrup is mild.:Add a few drops maple extract if the syrup is mild.
What I watch for
- Texture tells me more than the clock.I start checking early and keep baking or chilling until the recipe looks and feels right.
- Even pieces cook evenly.Apples that are close in size give a better bite and prevent random firm chunks.
- Small leaks are normal.Fruit desserts often bubble over a little; I care more about flavor and doneness than a spotless pan.
- I avoid rushing hot sugar or hot fruit.Both hold heat longer than they look like they should.
Storing and reheating
Pastry and crumb toppings soften with time, but a brief oven warm-up brings back some texture.
For reheating baked desserts, I prefer 325°F (163°C) to 350°F (177°C) for a few minutes. The microwave is faster, but it usually softens crusts and toppings.
What I serve with it
I serve this in the simplest way that fits the recipe: coffee with cake, vanilla ice cream with pie, or a small drizzle when the dessert already has enough sweetness. I do not like burying apple flavor under too many toppings.
Frequently asked questions
Can I use a regular pie dish?
No. This amount is built for a 10x15-inch jelly roll pan.
Can I make dough ahead?
Yes. Refrigerate up to 5 days or freeze up to 3 months.
Do I need maple icing?
No. The slab pie is good plain, with coarse sugar, or with caramel.
Why is the crust tough?
Too much water or too much kneading can make it tough. Add water gradually.
Can I serve it warm?
Yes, but squares cut cleaner after cooling for a few hours.
If you make this, leave a comment with the apple variety or small change you used. I always like seeing which details work in another kitchen.
