Makes 24-30 squares, depending how large you slice them. Brownies stay fresh stored in the refrigerator for 1 week.

1/2 cup (1 stick) salted butter
8 ounces coarsely chopped semi-sweet chocolate (I used 1 Bakers Baking Bar)
1 and 1/4 cups sugar
3 large eggs
1 teaspoon vanilla extract
3/4 cup all-purpose flour
1/4 teaspoon salt
8 ounces cream cheese, softened
1/4 cup sugar
1 egg yolk
1/4 teaspoon peppermint extract (or more, see note below)
2 drops green food coloring (or more, see note below)
2/3 cup mini chocolate chips