This recipe is similar to mkshroyer's with the exception it's made right in the baking dish. I've been making this for years, since getting the recipe in a Gold Medal Flour package. It's a family favorite and very rich! But ooooohhhhh soooooo tasty. :D
Hot Fudge Sundae Cake serves - 9
1 cup all-purpose flour*
3/4 cup granulated sugar
2 tablespoons baking cocoa
2 teaspoons baking powder
1/4 teaspoon salt
1/2 cup milk
2 tablespoons vegetable oil
1 teaspoon vanilla
1 cup chopped nuts, if desired
1 cup packed brown sugar
1/4 cup baking cocoa
1 3/4 cups very hot water
Ice cream, if desired
Heat oven to 350 F.
Mix flour, granulated sugar, 2 tablespoons cocoa, the baking powder and salt in ungreased square pan, 9x9x2 inches. Mix in milk, oil and vanilla with fork until smooth. Stir in nuts. Spread in pan.
Sprinkle brown sugar and 1/4 cup cocoa over batter. Pour water over batter.
Bake 40 minutes or until top is dry.
Spoon warm cake into dessert

. Top with ice cream. Spoon sauce from pan onto each serving.
* If using self-rising flour, omit baking powder and salt.