A moist and flavorful banana cake perfect for birthday celebrations, topped with creamy vanilla buttercream frosting.
1 1/2 cups all-purpose flour
1 teaspoon baking powder
1/2 teaspoon baking soda
1/4 teaspoon salt
1/2 cup unsalted butter, softened
1 cup granulated sugar
2 large eggs
1 teaspoon vanilla extract
3 ripe bananas, mashed (about 1 1/2 cups)
1/2 cup sour cream
1/4 cup whole milk
1 1/2 cups unsalted butter, softened (for frosting)
4 cups powdered sugar (for frosting)
2 teaspoons vanilla extract (for frosting)
2 to 4 tablespoons whole milk (for frosting)
Preheat the oven to 350°F (175°C). Grease and flour a 9-inch round cake pan.
In a medium bowl, whisk together the all-purpose flour, baking powder, baking soda, and salt. Set aside.
In a large bowl, beat the 1/2 cup softened butter and granulated sugar together until light and fluffy, about 3 minutes.
Add the eggs one at a time, beating well after each addition. Mix in 1 teaspoon vanilla extract.
Add the mashed bananas, sour cream, and whole milk to the wet ingredients and mix until combined.
Gradually add the dry ingredients to the wet ingredients, mixing just until combined. Do not overmix.
Pour the batter into the prepared cake pan and smooth the top with a spatula.
Bake for 30 to 35 minutes, or until a toothpick inserted into the center comes out clean.
Remove the cake from the oven and allow it to cool in the pan for 10 minutes. Then transfer to a wire rack to cool completely.
To prepare the frosting, beat the 1 1/2 cups softened butter until creamy.
Gradually add the powdered sugar, 1 cup at a time, beating well after each addition.
Add 2 teaspoons vanilla extract and 2 tablespoons whole milk. Beat until light and fluffy. Add more milk if needed to reach desired consistency.
Once the cake is completely cool, frost the cake evenly with the vanilla buttercream.
Decorate as desired for a birthday celebration.