INGREDIENTS
1/2 cup
unsalted butter (softened)
1 cup
sugar (divided)
1
large egg
1 1/4 cups
all-purpose flour
1/2 cup
powdered milk
1/4 cup
natural unsweetened cocoa powder
1 tsp
baking soda
1/2 tsp
kosher salt
1 tsp
vanilla extract
1 tsp
ground cinnamon
12
large marshmallows (cut in thirds)