Vanilla Cupcakes:

1 1/4 cups all-purpose flour (make sure to properly measure the flour!)
1/2 teaspoon baking powder
1/4 teaspoon baking soda
1/4 teaspoon salt
2 large eggs
1 cup granulated sugar
1/2 cup (1 stick) unsalted butter, softened
1 1/2 teaspoons vanilla extract
1/2 cup sour cream

Vanilla Buttercream Frosting:

1 (2 sticks) cup unsalted butter, softened
2 1/2 cups powdered sugar
1 Tablespoons vanilla extract
1 Tablespoon heavy whipping cream*
sprinkles