Backyard Hacks : Bake Sun Oven S’mores For Pre-K-Grade 4 Supplies: Shoebox, foil, tape, plastic wrap, graham crackers, marshmallow, chocolate bar Step 1: Line the inside of a shoebox with foil. Step 2: Layer the chocolate bar and marshmallow on top of a graham cracker, put a graham cracker on top and place it in the box. Step 3: Cover the top with plastic wrap and tape it down. Step 4: Place the box in direct sunlight until melted. Baking time may vary. Step 5: Remove the plastic wrap and chow down. Source: Generation Wild Colorado