Spoon batter into 2 Pam sprayed aluminum foil-lined 9 x 9 inch square pans. Bake at 350 degrees for 40 minutes or until a wooden pick inserted in cake comes out clean. Remove from oven; sprinkle each cake evenly with 2 cups miniature marshmallows and 1 cup pecans (optional). Return to oven, and bake 5 more minutes or just until marshmallows begin to melt. Remove from oven, and let cook on a wire rack. Bring butter, milk, and cocoa to a boil in a large saucepan over medium heat, stirring until butter melts. Remove from heat; whisk in powdered sugar and vanilla. Drizzle evenly over cakes in pans. Let cool completely. Cut cakes into squares.
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