Classic Confection Mars Snickers Squares, Peanut Brownie Gluten Free Merging a decadent baked good with an indulgent candy, Mars Snickers Peanut Brownie Squares are made to satisfy even the most indulgent sweet tooth. Peanuts are embedded in a rich brownie that's topped with salted caramel and enrobed in milk chocolate. Each bite of a Mars Snickers Peanut Brownie Square is the perfect combination of sweet and salty, smooth and crunchy for the ultimate snacking moment.