Prepare cake mix according to pkg directions; then pour batter into a 9x13-inch pan. Bake for 30 minutes, then remove from oven. Mix flour, sugar, butter, cinnamon, chocolate chips and chopped nuts in a bowl until mixture is fairly smooth. Spread mixture on top of cake, then return cake to oven. Bake remaindwe of time according to pkg. directions. Remove from oven, and cool 10 minutes. ----