Upside-Down Chocolate Cake

2 c Miniature marshmallows

1 c Brown sugar

1/2 c Cocoa

2 c Hot water

1 c Chopped walnuts; divided

1 pk Devil's food cake mix

; (2-layer size, prepa Per package directions) Place marshmallows in greased 13- by 9-inch pan. Mix sugar, cocoa and hot water. Add 3/4 cup nuts. Pour over marshmallows. Spoon cake batter over. Top with remaining nuts. Bake 45 to 50 minutes at 350 degrees. Remove from oven and turn out of pan. The cocoa-nut-marshmallow topping will have baked under batter to chocolaty richness. -----