Blackberry Filled Key Lime Cupcakes With Blackberry Frosting Recipes

Steps:

• Preheat oven to 350 degrees Fahrenheit. Grease or paper-line 30 baking cups.
• In a medium bowl combine the flour, baking soda, baking powder, and salt. In a separate mixing bowl, cream the butter and sugar. Beat in the eggs, one at a time. Add the vanilla, key lime juice and lime zest; mix well. Add the flour mixture to creamed mixture alternately with sour cream (batter will be thick). Fill muffin cups with 1/4 cup of batter. Bake at 350 degrees F for 20-25 minutes or until a toothpick inserted near the center comes out clean. Cool completely and frost as desired.
• Place blackberries in a small bowl and sprinkle with sugar, let thaw. Drain blackberries, reserving liquid. Squish the blackberries and push through a fine mesh sieve to remove the seeds, set aside. Add enough water to the blackberry liquid to equal 1 cup. In a large saucepan, combine the blackberry liquid, lemon juice, cornstarch, and salt. Heat and stir until the mixture boils and thickens. Cool completely. Refrigerate until ready to use. (This can be made several days in advance and any leftovers works well on toast, on pancakes, or mixed in plain Greek Yogurt.).
• Beat butter and vanilla until creamy. Mix in blackberry filling and salt. Add powdered sugar 1 cup at a time, beating until combined. Add milk 1 tablespoon at a time until you reach desired consistency.

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.