Graham Cracker Brownies

4 cups crushed graham crackers
2 cups sweetened condensed milk
2 teaspoons vanilla extract
Dash of salt
6 ounces chocolate chips
1 cup walnuts

Mix together in order given. Generously grease a 13 x 9-inch pan and bake at 375 degrees F for 40 minutes (do NOT over-bake). Dust with confectioners' sugar on both sides.