I found this one and it looks good...
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Triple Layer Brownies

Bottom Layer:

1 C. quick-cook rolled oats
1/2 C. all-purpose flour
1/2 C. brown sugar, packed
1/4 tsp. baking soda
1/4 tsp. salt
6 T. butter or margarine, melted

Combine first five ingredients, then add melted margarine. Mix well, pat
into 11 x 7 1/2 x 1 1/2 inch baking pan. Bake at 350 degrees F. for 10
minutes.

Middle Layer:

2/3 C. all purpose flour
1/4 tsp. baking powder
1/4 tsp. salt
1/4 C. milk
1/2 tsp. vanilla
3/4 C. granulated sugar
1/4 C. butter or margarine, melted
1 oz. unsweetened chocolate, melted and cooled
1 egg

In small bowl, combine dry ingredients. In separate bowl, combine milk
and vanilla. Set aside. In large bowl combine sugar, butter and melted
chocolate; add egg. Beat well. Add flour mixture in small amounts,
alternating with milk mixture, stirring well after each addition. Spread
over baked bottom layer, bake at 350 degrees F. for 25 minutes. Cool.

Top Layer:

1 oz. unsweetened chocolate
2 T. butter or margarine
1 1/2 C. sifted powdered sugar
1 tsp. vanilla
Hot water (about 2 T.)
1/2 C. chopped walnuts (Optional)

Melt chocolate and butter in small saucepan over low heat, stirring
constantly. Remove from heat when melted, stir in sugar and vanilla.
Blend in hot water to make almost pourable consistancy. Spread over
middle layer, top with walnuts if desired. Cool, cut, and enjoy!