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Flaky pastry, tender spiced apples, and a thin powdered sugar glaze make these apple slices disappear fast once they hit the table. The bottom crust stays firm instead of turning soft, and the top bakes into a crisp, golden lid that cracks just enough when you cut through it. These are the kind of bar cookies that look old-fashioned in the best way and taste even better the next day.

The trick is in the layer between the crust and the apples: crushed cornflakes. It sounds a little unusual, but that one step keeps the fruit juices from soaking into the pastry while the bars bake. Cold butter also matters here. You want a dough that bakes up flaky, not one that turns dense from overworking or gets greasy before it even reaches the oven.

Below you’ll find the small details that matter most, from sealing the top crust so the filling stays put to getting the glaze thin enough to drizzle in clean stripes.

The Cornflake Layer That Keeps the Bottom Crust Crisp

Apple bars fail when the fruit starts leaking before the pastry has a chance to set. That usually leaves you with a soft base and a filling that slides around when you cut it. The crushed cornflakes act like a dry buffer between the dough and the apples, and they keep the bottom layer from drinking in all that moisture.

Thinly sliced apples matter for the same reason. They cook through at the same pace as the pastry, so you don’t end up with a top crust that is done while the filling still tastes raw. The bars need a full cool-down before slicing, too. If you cut them warm, the filling will spread and the layers won’t hold.

• Cold butter — This is what gives the pastry its flaky layers. Room-temperature butter will blend too smoothly and the crust will bake up more like a short dough than a flaky bar crust.
• Cornflakes — Crush them by hand so you still have a little texture. A fine powder won’t protect the crust as well as small, uneven crumbs.
• Cornstarch — It thickens the apple juices as the bars bake. Without it, the filling can look loose and run out when you slice.

What Each Ingredient Is Actually Doing in These Apple Bars

• All-purpose flour — Gives the pastry enough structure to roll and lift cleanly. Pastry flour works too, but the dough will be a little more delicate.
• Egg yolk and milk — The yolk enriches the dough and the milk brings it together without making it sticky. Add the milk gradually so you stop as soon as the dough holds when pressed.
• Apples — Firm baking apples hold their shape best. Softer apples will break down faster and turn the filling mushier.
• Powdered sugar glaze — This is a finishing touch, not a thick frosting. Keep it loose enough to drizzle after the bars cool, or it will set in heavy streaks instead of a clean glaze.

Building the Bars So the Pastry Stays Flaky and the Filling Stays Put

Mixing the Dough Without Warming the Butter

Cut the cold butter into the flour mixture until the pieces look like coarse crumbs with a few pea-sized bits left behind. Those bigger bits are what create the flaky pockets in the baked crust. Once the egg yolk and milk go in, mix just until the dough comes together. If you knead it smooth, the crust will bake dense and tough.

Lining the Pan and Adding the Moisture Barrier

Press half the dough into the prepared pan in an even layer, getting it all the way into the corners. Sprinkle the crushed cornflakes evenly over the surface before the apples go on. If you leave bare spots, the filling will seep through there first and the bottom can turn soft in patches.

Layering the Apples and Sealing the Top

Toss the sliced apples with sugar, cinnamon, nutmeg, and cornstarch until every piece looks lightly coated. Spread them in an even layer so the bars bake uniformly. Roll out the top crust, lay it over the filling, and press the edges to seal. A few small slits in the top help steam escape and keep the crust from doming and tearing.

Baking Until the Top Turns Deep Golden

Bake until the pastry is golden and the filling is bubbling at the edges. That bubbling tells you the cornstarch has cooked enough to thicken the juices. If the top browns too quickly, set a loose piece of foil over it for the last part of the bake. Cool the pan completely before glazing and slicing, or the filling will still be loose inside.

Questions I Get Asked About This Recipe

Apple Slices

Apple slices baked in a flaky bar-cookie pastry with a spiced apple filling, layered on crushed cornflakes to prevent a soggy bottom. Golden-bake edges and a powdered sugar milk glaze drizzle create a neatly cut, rectangular dessert.

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Prep Time 25 minutes mins

Cook Time 35 minutes mins

Total Time 1 hour hr

Servings: 12 servings

Course: Dessert

Cuisine: American

Calories: 420

Ingredients Equipment Method Notes

Ingredients

  

For pastry

• 2.5 cup all-purpose flour
• 1 tsp salt
• 1 tbsp sugar
• 1 lb unsalted butter, cold and cubed Cold helps create flaky layers.
• 1 egg yolk
• 0.67 cup milk Use enough milk to make 2/3 cup with the egg yolk.

For apple filling

• 5 apples, peeled and thinly sliced
• 0.67 cup granulated sugar
• 2 tsp cinnamon
• 0.25 tsp nutmeg
• 2 tbsp cornstarch
• 1 cup crushed cornflakes Helps prevent a soggy bottom.

For glaze

• 1.5 cup powdered sugar
• 3 tbsp milk

Equipment

• 1 sheet pan

Method

 

Prepare and mix pastry

1. Preheat the oven to 375°F and grease a 15x10 rimmed baking sheet so the pastry releases easily.
2. Mix all-purpose flour, salt, and sugar, then cut in cold cubed unsalted butter until the mixture looks crumbly.
3. Stir the egg yolk and milk mixture into the crumbly mixture and mix just until the dough comes together.

Assemble the layers

1. Divide the dough in half and press one half into the bottom of the prepared baking sheet.
2. Spread the crushed cornflakes evenly over the pressed dough to create a moisture barrier.
3. Toss the apple slices with granulated sugar, cinnamon, nutmeg, and cornstarch, then spread the apples over the cornflakes.
4. Roll the remaining dough and lay it over the apples, then press the edges to seal.

Bake, cool, and glaze

1. Bake at 375°F for 30-35 minutes, until the pastry is golden.
2. Cool the bars completely before slicing so the filling sets.
3. Whisk powdered sugar with milk to make a pourable glaze, then drizzle over the top in stripes.
4. Cut into rectangles and serve after glazing.

Notes

Pro tip: keep the butter cold and avoid overmixing the dough so the layers stay flaky. Store covered in the refrigerator for up to 4 days; freeze baked, unglazed bars up to 2 months and thaw before glazing. For a lighter option, use unsalted butter alternatives or reduce sugar in the filling by about 1/4 without changing the baking time.