8 Tablespoons butter (2 sticks)
1 1/2 cup brown sugar
1 large egg
1 large egg yolk
2 tablespoon whole milk
2 teaspoon pure vanilla extract
2 cup all-purpose flour
1/2 cup cocoa powder
1 teaspoon kosher salt
1 teaspoon baking soda
1/2 teaspoon baking powder
1 bag of Nestle Tollhouse butterscotch chips (12 oz)