Best Blueberry Buckle

Step 1
Preheat the oven to 350 degrees F (175 degrees C). Butter and flour a 9-inch springform pan.

Step 2
Sift together flour, baking powder, and salt into a medium bowl.

Step 3
Beat sugar, butter, and egg in a large bowl with an electric mixer until smooth. Gradually pour in milk, beating until fluffy. Stir in flour mixture, making a stiff batter. Gently fold in blueberries and spread batter into the prepared springform pan.

Step 4
Make topping: Mix sugar, flour, butter, and cinnamon in a bowl until blended and crumbly in texture. Sprinkle over batter, then lightly press topping into batter with fingertips.

Step 5
Bake in the preheated oven until topping is golden brown and a toothpick inserted into the center of cake comes out with moist crumbs, about 40 minutes.