Good-Cooking - 4-H Brownies

Ingredients

• 1 cup butter or margarine
• 2 cups granulated sugar
• 4 eggs
• 1 1/2 cups all-purpose flour
• 1 teaspoon baking powder
• 1/2 teaspoon salt
• 12 tablespoons cocoa
• 2 teaspoons vanilla extract
• 1 cup chopped nuts (optional)