Hot Fudge Sunday Cake
["1 c. flour", "3/4 c. sugar", "2 Tbsp. cocoa", "2 tsp. baking powder", "1/4 tsp. salt", "1/2 c. milk", "2 Tbsp. vegetable oil", "1 tsp. vanilla", "1 c. chopped nuts", "1 c. packed brown sugar", "1/4 c. cocoa", "1 3/4 c. hot water"]
["Bake at 350\u00b0 for 40 to 45 minutes.", "Mix flour, sugar, cocoa and baking powder; stir in milk, oil, vanilla and nuts.", "Spread in 9-inch square pan.", "Mix 1/2 cup brown sugar and cocoa.", "Sprinkle over batter.", "Pour hot water over batter.", "Bake 45 minutes.", "Serve with Cool Whip."]
["flour", "sugar", "cocoa", "baking powder", "salt", "milk", "vegetable oil", "vanilla", "nuts", "brown sugar", "cocoa", "water"]