Banana Walnut Coffee Cake with Cinnamon Streusel

By AislePrompt Editorial · Published 2026-07-04 · Updated 2026-07-04

Moist banana coffee cake loaded with crunchy walnuts and topped with a cinnamon-scented streusel, perfect for breakfast or dessert. This American-inspired recipe, ready in about 65 minutes, layers ripe bananas, all-purpose flour, granulated sugar into a dessert worth slowing down for — great for weekend baking, holiday tables, or any time you want a sweet payoff at the end of a meal. Each serving lands at about 320 calories and feeds 8, so it slots into a weekend bake or a special-occasion dessert tray. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Ingredients

• 3 medium mashed ripe bananas
• 2 cups all-purpose flour
• 3/4 cup granulated sugar
• 1/4 cup packed brown sugar
• 1 tsp baking powder
• 1/2 tsp baking soda
• 1/2 tsp salt
• 1/2 cup softened unsalted butter
• 2 large eggs
• 1 tsp vanilla extract
• 1/2 cup sour cream
• 1 cup chopped walnuts
• 1 tbsp ground cinnamon

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Instructions

1. Step 1: Preheat oven to 350°F and grease a 9-inch square baking pan with butter.
2. Step 2: In a medium bowl, whisk together 2 cups all-purpose flour, 1 tsp baking powder, 1/2 tsp baking soda, 1/2 tsp salt, and 1 tbsp ground cinnamon until combined.
3. Step 3: In a large bowl, cream 1/2 cup softened unsalted butter with 3/4 cup granulated sugar and 1/4 cup packed brown sugar using an electric mixer until light and fluffy, about 3 minutes.
4. Step 4: Beat in 2 large eggs one at a time, then add 1 tsp vanilla extract and 1/2 cup sour cream, mixing until smooth.
5. Step 5: Stir in 3 medium mashed ripe bananas until evenly incorporated.
6. Step 6: Gradually add the dry flour mixture to the wet ingredients, folding in gently with a spatula until just combined.
7. Step 7: Fold in 1 cup chopped walnuts evenly throughout the batter.
8. Step 8: Pour batter into the prepared pan and smooth the top with a spatula.
9. Step 9: For the streusel topping, mix 1/4 cup brown sugar, 1/4 cup chopped walnuts, 1/4 cup all-purpose flour, and 2 tbsp cold unsalted butter cut into small pieces until crumbly; sprinkle evenly over batter.
10. Step 10: Bake for 45-50 minutes until a toothpick inserted in the center comes out clean and the top is golden brown.
11. Step 11: Let cool in the pan for 15 minutes before slicing and serving.