Chocolate Brownies
["1 stick butter", "2 (1 oz.) sq. baking chocolate", "1 c. sugar", "2 eggs", "1 tsp. vanilla", "1/2 c. chopped nuts (optional)", "3/4 c. flour, sifted", "1/2 tsp. baking powder", "1/2 tsp. salt"]
["Preheat oven to 350\u00b0.", "Melt butter and chocolate in saucepan over low heat.", "Remove from heat.", "Add sugar.", "Add 1 unbeaten egg; mix with a fork.", "Add other egg; mix again.", "Add vanilla and chopped nuts.", "Sift together the flour, baking powder and salt; add to mixture.", "Mix thoroughly.", "Pour into an 8-inch square pan. Bake for 25 to 30 minutes."]
["butter", "baking chocolate", "sugar", "eggs", "vanilla", "nuts", "flour", "baking powder", "salt"]