Ridiculously Easy Peanut Butter Shortbread Cookies - The Café Sucre Farine

very soft, I use salted butter

not natural

or milk, chopped into small chunks with a knife or 4 ounces of semisweet or milk chocolate chips, chocolate is optional

for sprinkling, You can use coarse sugar, Turbinado sugar, Demerara sugar or regular granulated sugar