Utensils: jelly roll pan
Preheat oven to 350F. In a mixing bowl, cream butter and sugar, add eggs and vanilla; beat until fluffy. Combine flour, baking powder, salt and cocoa; add to creamed mixture. Stir in nuts if desired. Spread in a greased, jelly roll pan. Bake for 15-18 minutes. Sprinkle marshmallows evenly over cake; return to oven for 2-3 minutes. Using a knife dipped in water, spread the melted marshmallows evenly over cake. Cool.
Combine chocolate chips, butter and peanut butter in a small saucepan, Cook over low heat, stirring constantly, until melted and well blended. Remove from heat; stir in cereal. Spread over bars. Chill. Cut into 36 bars.
Serve chilled (best) or at room temperature.
Cajun Country -- New Iberia, Louisiana