Go Back
–+ servings

Banana Sour Cream Coffee Cake

Ania
This banana sour cream coffee cake is packed with so much deliciousness! Every bite has a tender buttery crumb, lots of banana flavour, and a cinnamon sugar streusel. It’s the perfect way to start the day.
5 from 8 votes

Ingredients
 
 

For the cake

For the streusel

For the icing

Instructions
 

  • Line a 9x9 inch square metal pan with parchment paper and set aside. Preheat the oven to 350℉. Mash the bananas and set aside. Melt the butter and as it cools, prep the rest of your ingredients.
    3/4 cups bananas, 6 tbsp unsalted butter
  • In a small bowl, add the butter, cinnamon, flour, and sugar and mix with a fork or your hands until a wet sand texture forms. I recommend using your hands for this step! This will be your streusel. Set it aside.
    8 tbsp butter, 2 tsps cinnamon, 1 cup all-purpose flour, 3/4 cups light brown sugar
  • In a large bowl, add flour, baking soda, baking powder, cornstarch, and salt. Mix together and set aside.
    1 3/4 cups all purpose flour, 1 tsp baking powder, 1 tsp baking soda, 1/2 tsp salt, 1 tsp cornstarch
  • In a large bowl, whisk melted and cooled butter, oil, brown sugar, bananas, egg, vanilla, and sour cream until smooth.
    1/2 cup light brown sugar, 6 tbsp unsalted butter, 1/2 cup sour cream, 1 large egg, 1 tbsp vanilla, 2 tbsp oil
  • Add the dry ingredients. Using a spatula, gently fold until a soft batter forms. Do not overmix!!!
  • Spoon half of the batter into the prepared pan. Sprinkle with half of the streusel. Spread the remaining batter over the streusel. Then finish by sprinkling the remaining streusel.
  • Bake for 35-45 minutes or until a toothpick comes out clean. Mine took 42 minutes exactly!
  • Once cooled, make the glaze by mixing together the icing sugar and vanilla (or milk). Drizzle, allow it to set, and enjoy!
    1/2 cup powdered sugar, 1 tbsp vanilla