Prepare pudding as per directions. Do not refrigerate (yet).
Lay 4 1/2 graham crackers out on the bottom of a 9" x 9" pan (I used a glass baking dish). Top the graham crackers with about 1/3 of the marshmallows in a single layer (they should cover the entire bottom of the glass pan loosely). Pour 1/2 of hot pudding over the marshmallows. Repeat crackers, marshmallows and pudding for next layer. Top with the last of the graham crackers and the last of the marshmallows.
Place under broiler for about 3 minutes or until top marshmallows are toasted.
Refrigerate at least 4 hours up to overnight. Serve cold.