Key Lime Buttercream Frosting Recipes

Steps:

• 1. Beat first 4 ingredients at medium speed with an electric mixer until creamy.
• 2. Gradually add powdered sugar alternately with Key lime juice, 1 tablespoons at a time, and 1 tablespoons milk, beating at low speed until blended and smooth after each addition. Beat in up to 1 tablespoons additional milk for desired consistency.

Steps:

• For the vanilla cake: Butter and flour two 8-inch round cake pans; line the bottoms with parchment rounds. Position an oven rack in the middle of the oven and preheat to 350 degrees F.
• Sift together the flour, baking powder, baking soda and salt in a bowl. Set aside. Cream the butter and granulated sugar together in a mixer fitted with the paddle attachment on high speed until light and fluffy, about 2 minutes. Beat in the eggs one at a time, then the egg whites. Beat until smooth, about 30 seconds. Beat in the vanilla.
• Reduce the speed to medium and add the flour mixture in 3 parts, alternating with the buttermilk and beginning and ending with the flour, making sure to scrape the sides of the bowl several times. Beat on high to smooth the batter, 10 to 15 seconds. Remove the bowl from the mixer and fold the sprinkles in by hand.
• Divide the batter between the 2 pans and smooth the tops with a spatula. Bake until a tester inserted in the centers comes out clean, 30 to 35 minutes. Cool the cakes on a rack for about 15 minutes, then remove from the pans, peel off the parchment and cool completely.
• For the key lime buttercream: Cream the butter and cream cheese in a clean mixer bowl in the stand mixer fitted with the paddle attachment until light and fluffy, about 2 minutes. Add the confectioners' sugar and salt and beat on the lowest speed until combined. Add the vanilla, lime zest and 2 tablespoons of the juice, then slowly increase the speed to high and beat until very light and fluffy, 1 to 2 minutes, adding the last tablespoon of lime juice if the buttercream seems too stiff to spread easily.
• Set one cake layer on a serving platter or cake turntable if you have one. Spread the top with about 1 1/2 cups buttercream almost to the edges. Top with the other cake layer, flat-side up. Spread the top of the cake with a heaping cup of buttercream and smooth with a large offset spatula. Spread the remaining buttercream on the sides of the cake. Hold the offset spatula at a 45-degree angle to the cake and rotate the cake (or turntable) to smooth the edges, leaving a thin layer of buttercream with the layers slightly showing through.
• Sprinkle the top of the cake with sprinkles and decorate the edge with the lime slices. Chill the cake to set the layers for at least 30 minutes or up to 1 hour before serving.

Steps:

• Preheat the oven to 350 degrees F (175 degrees C). Line the bottom of two 8-inch round cake pans with parchment paper. Place a mixing bowl and beaters into a refrigerator to chill for whipped cream frosting.
• Whisk flour, baking powder, baking soda, and salt together in a bowl.
• Combine sugar and butter in the bowl of an electric stand mixer and beat at medium speed until mixture is creamy and smooth, 5 to 10 minutes. Meanwhile, beat eggs in another bowl until foamy.
• Slowly add beaten eggs to the bowl of the stand mixer and reduce speed to low. Add dry ingredients in small increments, alternating with buttermilk, until just combined. Add lime zest and juice and mix just until combined. Pour 1/2 of the batter into each prepared cake pan.
• Bake in the preheated oven until a toothpick inserted into the center of the cakes comes out clean, 15 to 20 minutes. Let cool completely in the pans on wire racks before removing, about 30 minutes.
• While cakes are cooling, make the curd. Add sugar, butter, lime juice, and zest to the top of a double boiler filled with at least 1 inch of water in the bottom. Set heat to medium and mix until butter melts. Add 2 tablespoons of the mixture to the beaten eggs and stir until combined. Reduce heat on the double boiler until water is simmering; add eggs and mix until curd coats the back of a wooden spoon, 20 to 25 minutes.
• Let curd cool slightly, about 10 minutes. Transfer to a glass container and refrigerate until needed.
• For the frosting, combine blackberries and lime juice in a small saucepan over medium heat. Cook and stir for 20 minutes. Strain the mixture; if less than 3 tablespoons of liquid results, add small amounts of water to the pulp until 3 tablespoons is achieved. Allow juice to cool to room temperature, about 10 minutes.
• Pour blackberry juice and butter into a mixing bowl and beat until creamy. Slowly add powdered sugar and vanilla extract and beat to a thick consistency. Add milk and beat until combined.
• Remove chilled mixing bowl and beaters from the refrigerator. Add heavy cream and beat until cream is frothy. Slowly add powdered sugar and vanilla extract while beating; beat until frosting can hold stiff peaks.
• To assemble, add a layer of blackberry frosting to the bottom cake layer. Pipe a spiral of blackberry frosting with 1 to 2 inches of space between rings; this will keep the cake from shifting when it's cut. Fill the space between the rings with curd. Refrigerate the cake to allow buttercream to firm up, 10 to 20 minutes.
• Place the second layer of cake on top of the spiral, then coat the whole cake in a generous layer of whipped cream frosting.

Steps:

• Preheat oven to 325 degrees F. Spray two 8-inch round cake pans with baking spray. Line bottom of each pan with a round of parchment paper, and then spray the parchment with baking spray. Set aside.
• Sift together the flour, baking powder, baking soda, and salt in a bowl; set aside.
• In the bowl of a stand mixer, beat the pureed avocado and the butter with the sugar until completely combined. Beat in vanilla. Beat in eggs one at a time, mixing well after each addition. With the mixer on low speed, beat in all of the buttermilk until just combined. Add the flour mixture in 3 additions, mixing each addition until just combined. Once all flour is incorporated, increase mixing speed to medium and beat for 20 seconds longer. Be careful to not over mix.
• Divide batter among the two prepared cake pans. Bake until golden on top and a wooden pick inserted in center comes out clean, about 25 minutes. Cool cakes in pans on racks for 10 minutes before inverting, removing parchment paper, and cooling completely.
• While the cakes are cooling, prepare the frosting.
• In the bowl of a stand mixer, cream the pureed avocado with the butter and cream cheese until smooth. With mixer on low speed, gradually add the confectioner's sugar. Once all the sugar is incorporated, add the lime juice and the vanilla. Add milk, as needed until frosting is light and fluffy. Increase mixing speed to medium and beat for 5 minutes. If frosting is too thin, add a bit more confectioner's sugar, if too thick adjust by adding a bit more milk.
• Place one of the cakes on a plate or platter. Spread the raspberry jam evenly over the surface. Place remaining cake on top. Spread or pipe top and sides of cake with buttercream.

Steps:

• Beat cream cheese, butter and sugar until smooth, about 5 minutes. Beat in lime zest and juice.