BANANA CAKE WITH CREAM-CHEESE FROSTING

Steps:

• Frosting:In the bowl of a mixer fitted with the paddle attachment, beat cream cheese on medium-low speed until smooth, about 1 minute. Beat in butter until smooth, 2 minutes. Reduce speed to low and beat in confectioners' sugar and salt until well combined.
• Increase speed to medium and beat until frosting is smooth and fluffy, about 1 minute. Transfer to an airtight container and refrigerate until firm, at least 3 hours and up to overnight.
• Cake:Preheat oven to 350 degrees. Lightly brush two 9-inch round cake pans with room-temperature butter. Line bottoms of pans with parchment rounds; lightly brush parchment with butter.
• In a medium bowl, whisk together flour, baking powder, baking soda, and salt. In a large bowl, whisk together melted butter, oil, granulated sugar, and bananas. Whisk in eggs and vanilla until well combined. Stir in flour mixture in two additions, alternating with buttermilk and beginning and ending with flour.
• Divide batter between prepared pans and bake until cakes are golden and a tester inserted in centers comes out clean, 35 to 40 minutes. Transfer pans to a wire rack; let cool 15 minutes. Turn cakes out onto rack, remove parchment, and let cool completely. Cakes can be frozen, tightly wrapped in plastic, up to 2 months.
• Place a cake layer, bottom-side down, on a cake stand. In a small bowl, stir grated chocolate into 1 cup frosting. Using an offset spatula, spread frosting evenly over top of cake. Top with remaining cake layer, bottom-side up. Refrigerate until firm, about 15 minutes. Spread remaining frosting evenly over top and sides of cake. Top with shaved chocolate. Cake can be assembled and refrigerated up to 1 day in advance; bring to room temperature before serving.