Preheat oven to 350°F. Line a 9-inch baking dish with parchment paper. Set aside.

In a medium saucepan, melt butter over medium heat. Remove from heat and add chocolate morsels and sugar. Stir until melted and smooth.

Stir in eggs one at a time, then add vanilla extract. Mix well.

Add cocoa powder, flour, salt, and baking powder. Stir gently until combined. Pour batter into prepared dish.

Bake for approximately 35 minutes. Remove from oven and let cool completely.

Prepare the mint frosting: Beat softened butter with powdered sugar, peppermint extract, green food coloring, and milk until fluffy.

Spread the mint frosting evenly over cooled brownies. Refrigerate while preparing ganache.

For the ganache, heat cream until warm but not boiling. Remove from heat and whisk in chocolate chips until smooth.

Pour ganache over the mint layer and spread evenly. Refrigerate for at least 1 hour before slicing.