Step 1

Preheat oven to 350F and line a 8-count muffin tin with paper liners.

Step 2

In a large mixing bowl, whisk together the dry ingredients.

Step 3

Add the wet ingredients (except the hot water and the sour cream) and mix well.

Step 4

Add hot water and stir again until batter is completely combined, then stir in sour cream.

Step 5

Divide batter evenly into prepared cupcake pan (filling liners approximately ¾ full) and bake at 350F for about 18 minutes. Allow cupcakes to cool in pan for 15 minutes before removing to a cooling rack and allowing to cool completely before frosting.

Step 6

In a large mixing bowl, combine all ingredients except the powdered sugar. Use an electric mixer to stir together until smooth, creamy, and well-combined,

Step 7

With mixer on low speed, gradually add powdered sugar until completely incorporated and frosting is smooth and creamy.

Step 8

3.Spread over cooled cupcakes.