Simple S’Mores Cake

Simple S’Mores Cake
1 package (about 15 ounces) milk chocolate cake mix
1 package (4-serving size) chocolate instant pudding
1 ½ cups milk
1 cup mini marshmallows
3 milk chocolate bars (1.55 ounces each), broken into ½ inch pieces OR 1 cup milk chocolate chips
3 whole graham crackers, crumbed into ½ inch pieces

Preheat oven to 350° F.  Spray 13X9 inch baking pan with nonstick cooking spray.
Combine cake mix, pudding mix and milk in large bowl; beat 1 – 2 minutes or until well blended.  Spread batter in prepared pan
Bake 30 – 35 minutes or until toothpick inserted into center comes out clean. 
Turn oven to broil
Sprinkle marshmallows, chocolate and graham crackers over cake.  Broil 6 inches from heat source 30 seconds to 1 minute or until marshmallows are golden brown. (Watch carefully to prevent burning.)
Cool at least 5 minutes before serving.