Simply pour the mason jar mix into a bowl and add 1 egg, a 1/3-1/2 cup slightly melted butter (start with 1/3 cup of butter and then add extra butter, as needed), and 1 teaspoon of vanilla. Combine and bake at 350 degrees for 7-10 minutes. 

Contains: flour, baking soda, salt, brown sugar, white sugar, and sprinkles.

*May contain trace amounts of common allergens: wheat/gluten, peanuts, tree nuts, milk, soy and eggs.