Tri-level Brownies

Another one of grandma's yummy dessert recipes.

Tri-Level Brownies
Bottom layer: Sift together 1/2 c flour, 1/4 tsp baking soda and 1/4 tsp salt, mix with 1 c quick oats and 1/2 c brown sugar. Stir in 6 T melted butter. Pat mixture into a 12x8" pan and bake at 350 for 10 minutes.
Middle layer: Combine 1 oz melted unsweetened chocolate, 4 T melted butter and 3/4 c sugar; add 1 egg and beat well. Sift together 2/3 c flour, 1/4 tsp baking powder and 1/4 tsp salt, add alternately with 1/4 c milk and 1/2 tsp vanilla to chocolate mixture. Fold in 1/2 c chopped nuts. Spread batter over baked layer. Bake at 350 for 25 minutes.
Top layer: Place 1 oz unsweetened chocolate and 2 T butter in small saucepan. Stir over low heat until chocolate melts. Remove from heat and add 1 1/2 c powdered sugar and 1 tsp vanilla. Blend in enough hot water to form frosting. Spread over baked layer when cooled.