Lemon Cupcakes with Blackberry Buttercream

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Lemon Cupcakes with Blackberry Buttercream
Light and Fluffy Lemon Cupcakes are topped with gorgeous swirls of Blackberry Buttercream!
Ingredients
For the cupcakes
  • 1 3/4 cups cake flour
  • 1 1/4 teaspoons baking powder
  • 1/2 teaspoon baking soda
  • 1/4 teaspoon salt
  • 1/2 cup sour cream (I used full fat)
  • 1/2 cup milk (I used whole)
  • 2 teaspoons vanilla extract
  • 2 large egg whites, at room temperature
  • 1 stick (4 ounces) unsalted butter, melted
  • 1 cup granulated sugar
  • Zest of one lemon (about 2 teaspoons)
  • For the Blackberry Buttercream:
  • 1 cup blackberries
  • 2 tablespoons lemon juice
  • 2 sticks (8 ounces) unsalted butter, VERY soft
  • 1/2 teaspoon salt (do not SKIP!)
  • 4 cups confectioners sugar (more if needed), sifted
Instructions
  1. Preheat oven to 350 degrees (F). Line a 12 mold muffin tin with paper liners; set aside.
  2. In a medium bowl combine flour, baking powder, baking soda, and salt; mix well to combine. Set aside.
  3. In a large measuring cup or bowl combine sour cream, milk, vanilla, and egg whites; mix well to combine. Set aside.
  4. In a small bowl combine sugar and lemon zest. Using your fingertips, rub the zest IN to the sugar, until fragrant and well combined
  5. In a large bowl or stand mixer fitted with the paddle attachment beat melted butter and sugar on medium speed until well combined; about 2 minutes.
  6. Slowly add the flour mixture to the butter/sugar combination, beating until just combined. Add in sour cream/milk/egg combo and beat on low until *just combined. Over-mixing will result in a dryer/denser cake.
  7. Divide the cupcake batter evenly into the 12 molds, then place the pan in the oven. Bake for about 16 minutes, or until a toothpick inserted into the center of a cupcake comes out clean. Allow cupcakes to cool completely before topping with frosting.
  8. For the blackberry buttercream:
  9. Combine the blackberries and lemon juice in a small saucepan. Bring to a simmer over medium heat, and stir constantly until blackberries have become soft enough to mash effortlessly.; about 6-7 minutes It will look like blackberry jam. Once the mixture can coat a spoon (you will have about 1/4 cup of blackberry puree) remove from heat. Place a fine-mesh strainer over a small bowl and push the puree though, leaving any seeds/large chunks behind. Allow mixture to cool completely before using.
  10. When ready to make buttercream:
  11. Place soft butter in the body of a stand mixer fitted with the paddle attachment; beat butter on medium-speed until completely smooth, scraping down the sides when needed; about 2 minutes. Add in the blackberry puree and beat until completely combined, scraping down the sides of the bowl if needed. Add in the confectioners sugar, one cup at a time, on low speed. Once all of the sugar has been added, add in salt then increase speed to medium-high and beat for 2 full minutes. Ice cupcakes as desired
  12. Cupcakes can be made up to 6 hours ahead of time, but be sure to store in the fridge and bring to room temperature 30 minutes before serving.
Recipe Notes

For a stronger lemon taste, add 1 or 2 teaspoons of lemon juice to the batter. To do this, quickly stir it in right at the end, mixing just until combined.

Gallery of Lemon Cupcakes with Blackberry Buttercream

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