Preheat oven to 375.
In large mixing bowl, beat together brown sugar and butter about 3-4 minutes until creamy.
Add sour cream, vanilla, milk, and eggs, whisking thoroughly until smooth and creamy.
In small bowl, stir together flour, baking powder, and salt, then add to butter mixture and stir until incorporated.
Fill greased or paper-lined muffin tins 2/3 full with batter, and bake 15-20 minutes until lightly brown.
Remove from oven and cool. When cool, ice with Whipped Honey Buttercream Frosting
In medium bowl, whip butter until light and creamy.
Add confectioner's sugar, and beat carefully until smooth.
Add honey and sour cream and beat until smooth.
Chill until ready to frost cupcakes