4 Red Delicious apples - peeled, cored, and thinly sliced
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0.75 cup white sugar
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3 tablespoons ground cinnamon
Instructions
Preheat the oven to 350 degrees F (175 degrees C). Grease an 8-inch square baking dish with cooking spray.
Mix together oats, brown sugar, flour, and melted butter in a large bowl until crumbly. Spread 1/2 of the oat mixture into the bottom of the prepared baking dish and press firmly to form a crust. Arrange apple slices over crust.
Mix together white sugar and cinnamon in a medium bowl; sprinkle over apples. Crumble remaining oat mixture on top.
Bake in the preheated oven until topping is golden brown, 40 to 45 minutes.