chocolate buttercream frosting

ingredients:
1/3 cup unsalted butter
1 1/3 cup confectioners sugar
1/4 cup Dutch-process cocoa power
1 tbsp milk
a handful of semi sweet chocolate chips (to taste)
1 splash of imitation vanilla flavor

directions:
in medium bowl, beat butter until softened
stir in sugar and cocoa and beat until well combined
melt in chocolate chips
add milk and vanilla and beat until soft and fluffy

variations (do one of the following:

1. store in a few tablspoons of nutella for chocolate-hazelnut
2. instead of milk, add prepapre espresso for chocolate-mocha
3. to make it taste more fudgey, add melt 1/4 cup semi sweet chocolate chips
4. use 1/8-1/4 cup andes mint chocolate baking chips (available seasonly) for mint chocolate chip frosting