They are soft, buttery, and so delicious! A layered bar with sweet and tangy raspberries and a thick streusel crumble. The perfect summer dessert!
Preheat the oven to 350°F. Line a 9x13-inch pan with parchment paper and set it aside.
Mix 2 cups all-purpose flour, 2 cups rolled oats, 1 and ½ cups brown sugar, ½ teaspoon ground cinnamon, and 1 teaspoon of baking powder in a large bowl. Stir in 1 cup of melted salted butter until a crumble-like mixture forms.
Press ⅔ of the mixture into your prepared pan. Bake for 10 minutes in the preheated oven.
Meanwhile, in a medium bowl, toss 2 and ½ cups of raspberries with ½ cup of granulated sugar, 2 tablespoons of flour, and the juice of one lemon.
Arrange raspberries on top of the baked bottom layer evenly. Sprinkle the remaining crumble over top. Bake for another 25 to 30 minutes. Let cool on a wire rack before slicing into squares.