Blueberry Crumb Cake Recipe

For the cake :

• Preheat the oven to 350 degrees F.
• Butter and flour a 9-inch round baking pan.

For the streusel :

• Combine the granulated sugar, brown sugar, cinnamon, and nutmeg in a bowl.
• Stir in the melted butter and then the flour.
• Mix well and set aside.

For the cake :

• Cream the butter and sugar in the bowl of an electric mixer fitted with the paddle attachment on high speed for 4 to 5 minutes, until light.
• Reduce the speed to low and add the eggs 1 at a time, then add the vanilla, lemon zest, and sour cream.
• In a separate bowl, sift together the flour, baking powder, baking soda, and salt.
• With the mixer on low speed, add the flour mixture to the batter until just combined.
• Fold in the blueberries and stir with a spatula to be sure the batter is completely mixed.
• Spoon the batter into the prepared pan and spread it out with a knife.
• With your fingers, crumble the topping evenly over the batter.
• Bake for 40 to 50 minutes, until a cake tester comes out clean.
• Cool completely and serve sprinkled with confectioners' sugar.