Chewy and spiced apple crumble oatmeal bars with a buttery rolled oat crust, tender cinnamon apples, and a crisp streusel topping.

Scale

For The Crumb Layers:

1 and 1/4 cup all-purpose flour, spooned & leveled

1 cup old-fashioned rolled oats, not quick oats or instant oats

1 teaspoon cinnamon

1/4 teaspoon salt

2/3 cup melted butter, cooled to room temperature

3/4 cup brown sugar, packed

1 teaspoon vanilla

1 large egg yolk

1 tablespoon flour

1 tablespoon brown sugar

For the Apple Layer:

2 large apples, cored, pealed and sliced about 1/4 inch thick

1 tablespoon granulated sugar

1 teaspoon cinnamon

1/4 teaspoon ground nutmeg

2 teaspoons cornstarch

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1. Preheat oven to 350°F (175°C) and line an 8×8-inch pan with parchment paper.

2. Mix 1 1/4 cups flour, rolled oats, 1 tsp cinnamon, salt, melted butter, 3/4 cup brown sugar, vanilla, and egg yolk until crumbly.

3. Press two-thirds of the mixture into the pan and bake for 10 minutes to pre-set crust.

4. Toss sliced apples with granulated sugar, 1 tsp cinnamon, nutmeg, and cornstarch in a bowl.

5. Mix remaining crumb dough with 1 tbsp flour and 1 tbsp brown sugar; layer apples over crust and top with streusel.

6. Bake at 350°F for 30 to 35 minutes until bubbly, cool completely, chill for 30 minutes, and slice.

Pre-bake bottom crust 10 minutes to prevent sogginess. Cool completely before slicing.