Lemon Cupcakes with Blackberry Buttercream

I've been on some kind of cupcake kick lately.  I blame all the cute pictures of cupcakes on the internet!  I just can't resist! This is another delicious cupcake recipe that is perfect for summertime.  The lemon and blackberry flavors are tart and refreshing.  If you don't have blackberry jam, you could probably try substituting raspberry or strawberry and still achieve excellent (and tasty) results. The original recipe says that it makes 24 cupcakes, but you will really only have enough batter for about 14-16 cupcakes.

LEMON CUPCAKES WITH BLACKBERRY BUTTERCREAM
Adapted slightly from allrecipes.com

INGREDIENTS - CAKE
1 cup white sugar
1/2 cup butter
2 eggs
1 1/2 teaspoons vanilla extract
1 1/2 cups all-purpose flour
1 3/4 teaspoons baking powder
1/2 cup low-fat milk
1 large lemon, juice and zest (or juice and zest of two small lemons)

INGREDIENTS - BUTTERCREAM
1 cup butter, softened
1 teaspoon vanilla extract
1/4 teaspoon salt
4 cups confectioners' sugar
1/2 cup seedless blackberry jam

DIRECTIONS 
1. Preheat oven to 350 degrees F (175 degrees C). Line muffin cups with paper liners. 

2. Cream sugar and 1/2 cup butter in the bowl of a stand mixer until fluffy. Beat in eggs, one at a time, and mix 1 1/2 teaspoons vanilla extract into mixture with the second egg. 

3. Beat in flour and baking powder until just combined; beat in milk, lemon juice, and lemon zest to make a smooth batter. Do not overmix. 

4. Spoon the batter into the prepared muffin cups (about 2/3 full). 

5. Bake in the preheated oven until cupcake edges are slightly golden brown and a toothpick inserted into the center of a cupcake comes out clean, 20 to 25 minutes. Cool cupcakes completely. 

6. For the buttercream, beat 1 cup butter with 1 teaspoon vanilla extract and salt until smooth and creamy. Beat in confectioners' sugar, 1 cup at a time, to make a creamy frosting. Beat in blackberry jam. Spread frosting on cooled cupcakes.