Cocoa Brownies
["1/2 c. soft butter", "1 c. sugar", "2 eggs", "1 tsp. vanilla", "1/2 c. flour", "6 Tbsp. cocoa"]
["Grease 8 x 8 x 2-inch pan.", "Mix thoroughly.", "Pour into pan and bake at 325\u00b0 for 30 minutes.", "One-half cup nuts may be added if desired."]
["butter", "sugar", "eggs", "vanilla", "flour", "cocoa"]