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Blueberry Banana Coffee Cake

Soft and moist Blueberry Banana Coffee Cake with a buttery crumble topping.
Made with ripe bananas and juicy blueberries.
Perfect for breakfast, brunch, or dessert.
Prep Time 15 minutes
Course Dessert / Breakfast
Cuisine American

Ingredients
  

Cinnamon Brown Sugar Crumble

  • ½ cup light brown sugar packed
  • ¼ cup walnuts chopped
  • 1 cup all-purpose flour
  • ½ teaspoon cinnamon
  • teaspoon salt
  • ½ cup unsalted butter melted

Blueberry Banana Coffee Cake

  • ½ cup unsalted butter melted and slightly cooled
  • 1 medium banana ripe and mashed
  • 1 ¼ cups blueberries fresh or frozen
  • ½ cup light brown sugar packed
  • ½ cup granulated sugar
  • 1 teaspoon lemon zest optional
  • 2 teaspoons vanilla extract
  • 2 large eggs room temperature
  • ½ cup sour cream room temperature
  • 1 ½ cups all-purpose flour
  • 1 teaspoon baking powder
  • ¾ teaspoon baking soda
  • ½ teaspoon salt

Instructions
 

  • Prepare the crumble: In a bowl, mix flour, cinnamon, salt, brown sugar, and walnuts. Stir in melted butter until crumbly. Chill in the fridge.
  • Preheat oven to 350°F (175°C). Grease and line an 8×8-inch pan with parchment paper.
  • In a bowl, whisk flour, baking powder, baking soda, and salt.
  • In another bowl, combine sugars and lemon zest, rubbing zest into sugar. Whisk in melted butter.
  • Add mashed banana, sour cream, eggs, and vanilla. Mix until smooth.
  • Fold dry ingredients into wet mixture gently. Stir until just combined.
  • Fold in blueberries carefully.
  • Pour batter into prepared pan.
  • Sprinkle crumble evenly on top.
  • Bake for 45–50 minutes until a toothpick comes out clean.
  • Cool before serving. Enjoy your Blueberry Banana Coffee Cake warm or at room temperature.

Notes

  • Frozen blueberries can be used without thawing
  • Serve with whipped cream or yogurt for a brunch twist
  • Add a pinch of nutmeg for deeper spice flavor