1 c. graham cracker crumbs
1 c. milk chocolate chips
1/4 c. butter
3/4 c. sweetened condensed milk
2 c. miniature marshmallows

Preheat oven to 350 degrees; 325 degrees if using a glass pan. Put the butter into an 8-inch square baking pan and place in oven until butter is melted. Take pan out and sprinkle graham crackers evenly over butter. Pour the sweetened condensed milk over the graham cracker crumbs. Sprinkle the chocolate chips. Spread the marshmallows. Use your fingers to press down evenly. Put the pan in the oven and bake for 30 minutes. Remove and let cool completely before cutting into squares.