Simply pour the mason jar mix into a bowl and add an egg, a 1/2 cup of butter, and 1 teaspoon of vanilla. Combine and bake at 350 degrees for 8-12 minutes.
Substitute equal amounts of peanut butter instead of the butter to make these cookies extra tasty.
Contains: flour, oats, baking soda, baking powder, salt, brown sugar, white sugar, Reese's Pieces, and chocolate chips.
*May contain trace amounts of common allergens: wheat/gluten, peanuts, tree nuts, milk, soy and eggs.