Step 1

Preheat oven to 400°F and grease a 9-inch round cake pan with nonstick cooking spray.

Step 2

In a large bowl, mix together the Bisquick, egg, milk, sugar, and cinnamon. Stir until just combined.

Step 3

Spread the batter into the prepared baking pan.

Step 4

Top with fresh blueberries.

Step 5

Prepare the crumb topping by adding the Bisquick, brown sugar, cinnamon and butter together in a medium bowl. Use a pastry blender or fork to blend then ingredients until the mixture resembles coarse sand.

Step 6

Sprinkle the topping over the blueberries.

Step 7

Bake in the preheated oven for 25 minutes, until a toothpick inserted in the center comes out clean.

Step 8

Allow the cake to cool slightly before serving.