1 1/2 cup margarine, 4 eggs, 1cup unsweetened cocoa, 1 1/2 cups all-purpose flour, 2 cups granulated sugar, 1/4 teaspoon salt, 1 1/4 cups chopped pecans, 3 cups miniature marshmallows, 1 pound box powered sugar, 1/2 cup milk, 1/2 teaspoon vanilla extract.
Preheat oven to 350 degrees. In large bowl, with electric mixer at medium speed, beat 1 cup margarine, eggs and 1/2 cup cocoa until well combined. Blend in flour, granulated sugar, salt and pecans. Spread batter in greased 13x9x2-inch baking pan. Bake at 350 for 30 to 35 minutes or until cake pulls away from sides of pan.
Sprinkle marshmallows over hot cake; return to oven for 2 minutes or until marshmallows are slightly puffed.
In medium bowl, with electric mixer at medium speed, beat remaining 1/2 cup margarine, powered sugar, remaining 1/2 cup coca and milk until smooth; spread immediately over marshmallows. Cool cake completely on wire rack. Cut into squares to serve. Makes 24 servings.