Source: Confections of a Foodie Bride
Blackberry Cupcakes with Blackberry Buttercream Frosting
Adapted from Cook’s Illustrated Classic White Layer Cake
Yields 24 cupcakes
3 6oz packs blackberries
1/3 cup milk, at room temperature
6 large egg whites, room temperature
2 tsp lemon juice
2 1/4 cup cake flour, sifted
1 3/4 cup sugar
4 tsp baking powder
1 tsp salt
12 Tbsp unsalted butter (1 1/2 sticks), softened
1 recipe Blackberry Buttercream Frosting, recipe follows
Preheat oven to 350 degrees and prepare two muffin pans with liners.
Puree blackberries in a food processor or blender. Scrape into a fine mesh sieve set over a bowl. With a rubber spatula, work the blackberries through the sieve, leaving seeds behind. Remove 1/4 cup of puree for the frosting. Your mileage may vary but you should have ~2/3 cup of blackberry puree leftover.
In small bowl, combine puree, milk, egg, vanilla and mix with fork until well blended. In bowl of stand mixer, add sifted flour, sugar, baking powder and salt and mix to combine. Continue beating at slow speed and add butter. Mix until combined and resembling moist crumbs.
Add liquids and beat at medium speed for about 1 minute or until full and evenly combined. Stop mixer to scrape down the sides of the bowl and beat for 30 more seconds. Fill cupcake liners ~3/4 full.
Bake for about 20 minutes or until a toothpick inserted in the center cupcake in each pan comes out clean. Let cupcakes cool in pans and then transfer to a covered plate.
Blackberry Buttercream Frosting
2 sticks butter unsalted butter, softened
1/2 tsp vanilla
1/4 tsp almond extract
5 cups confectioner’s sugar
1 Tbsp meringue powder
pinch of salt
1/4 cup blackberry puree
Cream butter and extracts until smooth. Mix in confectioner’s sugar, meringue powder, and salt and beat 2-3 minutes on high. Add blackberry puree and beat for an additional minute. Adjust consistency, if desired, with additional confectioner’s sugar or water.