Low-Fat Mint Brownies
["12 Tbsp. cocoa (powdered)", "4 Tbsp. canola oil", "2/3 c. light margarine", "2 c. sugar", "8 egg whites", "1 tsp. mint extract", "1 1/4 c. flour", "1 tsp. baking powder", "1 tsp. salt", "1 c. chopped nuts (optional)"]
["Preheat oven to 350\u00b0.", "Spray baking pan (13 x 9 x 2-inch) with cooking spray.", "Mix ingredients and spread in pan.", "Bake 30 minutes; cool.", "Cut into squares. Serves 32."]
["cocoa", "canola oil", "light margarine", "sugar", "egg whites", "mint", "flour", "baking powder", "salt", "nuts"]