Gold Rush Brownies

2 cups graham cracker crumbs
1 can sweetened condensed milk
1 (6 ounce) package chocolate chips
1/2 cup pecans or walnuts, chopped

Mix all ingredients together. Spread in a lightly greased 11 x 7 x 1 1/2-inch pan. Bake at 350 degrees F for 30 minutes. Cut into squares while still slightly warm.