Combine flour, baking powder, salt, cocoa, and sugar. Blend in shortening, eggs, and vanilla. Add walnuts. Spread in greased baking pan and bake at 350° for 20 minutes. Take from oven; sprinkle miniature marshmallows over the top, keeping away from sides. Put back into oven for 3 minutes.
Combine brown sugar, water, and chocolate. Boil for 3 minutes; take from burner and add butter, vanilla, and powdered sugar (enough to make smooth icing). Spread over marshmallows and let cool. Cut in squares.
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