INGREDIENTS
1 stick
unsalted butter, softened
1/2 cup
granulated sugar
1/2 cup
light brown sugar, packed
1
large egg
1/2 tsp
pure vanilla extract
1 cup
all-purpose flour
1/2 cup
plus 2 tablespoons unsweetened cocoa powder
1/2 tsp
baking soda
1/4 tsp
kosher salt
1 cup
mini chocolate chips
1 cup
M&M’s Mini’s Baking Chips