INGREDIENTS
1/2 cup
(68g) all-purpose flour
2 tsp
natural cocoa powder
1/4 tsp
baking soda
1/8 tsp
salt
4 tbsp
unsalted butter (very soft*)
1/4 cup
granulated sugar
1 tbsp
brown sugar
1
large egg yolk
1 tsp
milk
1/2 tsp
vanilla extract
1/2 cup
mini M&M's or chocolate chips (or (2 1-ounce mini M&M tubes))