Spray a 13x9 baking pan with cooking spray. Set aside.
In a medium bowl, combine the melted butter and graham cracker crumbs. Spread evenly in the baking pan. Press down with either a rubber spatula or your hand.
Sprinkle the chocolate chips evenly over graham crumb mixture. Pour the can of sweetened condensed milk over. Spread with a rubber spatula. Layer the remaining ingredients. Press down gently with your hands.
Bake in a preheated 350 degree F oven for about 30 minutes or until lightly golden brown. Let cool on a wire rack. Cut into bars.