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This easy blueberry crisp has a toasty oat topping and sweet, juicy filling bursting with fresh berries. It's the perfect simple summer dessert.
Preheat oven and make filling: Preheat oven to 375°F. Make the filling: Mix blueberries, sugar, cornstarch, lemon juice, and salt in a bowl.
Place filling in baking dish: Transfer to an 8-inch square baking dish.
Make topping: Stir together flour, oats, baking powder, and salt.
Cream butter and sugar: Cream butter and sugar with a mixer until pale and fluffy. (You can use a hand-mixer or, if your butter is soft enough, the mixture can be stirred together by hand.)
Add dry ingredients and mix into clumps: Stir dry ingredients into butter. Using your hands, squeeze topping pieces together into clumps.
Sprinkle topping over filling: Sprinkle topping evenly over filling.
Bake, cool, and serve: Bake until bubbling in center and brown on top, about 1 hour. If topping is browning too quickly, tent baking dish with foil. Transfer to a wire rack, and let cool for 30 minutes before serving.