Preheat the oven to 350°, or 325° for a glass dish.
LAYER #1: In a 13x9-inch baking pan, melt the butter in the microwave and pour it into the pan. Alternatively, put the butter in the pan and melt it in the oven.
LAYER #2: Sprinkle the graham cracker crumbs over the butter.
LAYER #3: Pour the sweetened condensed milk evenly over the crumbs.
LAYER #4: Sprinkle the coconut evenly over the top.
LAYER #5: Sprinkle the walnuts evenly over the top.
LAYER #6: Sprinkle the chocolate chips evenly over the top.
LAYER # 7: Sprinkle the M&M’s evenly over the top.
Bake for 25-30 minutes or until lightly browned.
Cool in the pan on a wire rack. Cut them into bars when completely cooled.
Store the bars covered at room temperature.