A tender, buttery blueberry coffee cake topped with cinnamon streusel—perfect for breakfast, brunch, or an anytime treat.
Cake:
1½ cups all-purpose flour
1 tsp baking powder
½ tsp baking soda
¼ tsp salt
½ cup (1 stick) unsalted butter, softened
¾ cup granulated sugar
2 large eggs
1½ tsp vanilla extract
½ cup sour cream
1 cup fresh or frozen blueberries
1 tsp flour (to toss berries)
Streusel Topping:
⅓ cup flour
⅓ cup brown sugar
½ tsp cinnamon
3 tbsp cold butter
Optional Glaze:
½ cup powdered sugar
1–2 tsp milk
¼ tsp vanilla
Make streusel: Combine flour, sugar, cinnamon, and cold butter. Mix until crumbly.
Preheat oven to 350°F. Grease or line an 8×8 pan.
Cream butter and sugar until light. Add eggs and vanilla. Mix well.
In a separate bowl, whisk dry ingredients.
Add dry mix to wet, alternating with sour cream.
Toss blueberries in 1 tsp flour and gently fold in.
Pour batter into pan. Top with streusel.
Bake 40–45 minutes or until a toothpick comes out clean.
Cool and drizzle with glaze if using.
Use lemon zest for a citrus twist.
Store covered at room temp for 3 days.
Freezes beautifully.