An ultra-moist banana cake made with overripe bananas and sour cream, topped with a rich, creamy frosting. This large-batch cake is perfect for feeding a crowd and stays tender and flavorful for days.
3 cups sugar
6 large eggs
1 1/2 cups butter, melted
10–11 overripe bananas, mashed
2 tablespoons vanilla extract
1/4 cup full-fat sour cream
6 cups all-purpose flour
1 tablespoon baking soda
3/4 teaspoon salt
1 cup walnuts or pecans, chopped (plus extra for garnish)
2 pounds powdered sugar
1 cup butter, melted (for frosting)
1 tablespoon + 1 teaspoon vanilla extract (for frosting)
1/4 cup milk
1/4 cup full-fat sour cream (for frosting)
Use very ripe bananas for best flavor and moisture.
Full-fat sour cream gives the best texture.
The cake can be baked a day ahead and frosted before serving.
Nuts can be omitted for a smoother texture.