Recipe: Chocolate Banana Cake with Salted Peanut Butter Frosting

Name: Recipe: Chocolate Banana Cake with Salted Peanut Butter Frosting
Ingredients: Butter or cooking spray, for coating the pan; 12 tablespoons (1 1/2 sticks) unsalted butter, at room temperature; 3/4 cup granulated sugar; 3/4 cup packed light brown sugar; 3 large eggs; 2 cups mashed bananas (from 4 to 5 large bananas); 2 teaspoons vanilla extract; 3 cups all-purpose flour; 1/4 cup unsweetened cocoa powder; 1 1/2 teaspoons baking soda; 1 teaspoon kosher salt; 1 1/2 cups whole milk; 6 ounces chopped semisweet chocolate (1 cup); 1 cup creamy peanut butter; 6 ounces cream cheese, at room temperature; 6 tablespoons unsalted butter, at room temperature; 1/3 cup powdered sugar; 1 teaspoon vanilla extract; Flaky sea salt, for sprinkling