Key Lime Cupcakes with Blackberry Frosting

Here is the second cupcake that I made for the Surprise 50th Birthday Party.  I already made Chocolate Chip Cupcakes with Peanut Butter Frosting, so I wanted something fruity.  I am a huge fan of Key Lime flavor anything so I had been wanting to try these for a while.

Key Lime Cupcakes
1 cup softened, unsalted butter
2 cups sugar
3 eggs
2 tsp vanilla
4 tbsp key lime juice (I use Nelliie & Joe's Famous Key West Lime Juice)
zest of 2 limes plus the juice
3 1/2 cups flour
1 tsp baking soda
1/2 tsp baking powder
1/2 tsp salt
2 cups sour cream
Cream the butter and sugar in the stand mixer and then add the eggs, vanilla, lime juices and zest.  In a separate bowl combine the flour, baking soda, baking powder and salt.  Alternatively combine the dry ingredients with the sour cream into the mixture.  Mixture will make around 24 cupcakes.  Bake at 350 for 20-25 minutes.

Blackberry Frosting
1 cup softened, unsalted butter
1 tsp vanilla
2/3 cup seedless blackberry preserves
6 cups powdered sugar
3 tablespoons milk
Beat the butter and vanilla until smooth.  Mix in the blackberry preserves and slowly add in the powdered sugar.  After all the sugar is combined, slowly add the milk in, a tablespoon at a time, until the desired consistency.