Yogurt Coffee Cake
["1/2 c. butter or margarine, softened", "1/2 c. packed light brown sugar", "1 egg", "1 tsp. vanilla", "2 c. flour (whole wheat gives better flavor and texture)", "1 tsp. baking soda", "1/2 tsp. baking powder", "1/4 tsp. salt", "1 c. fruit flavored yogurt"]
["Cream butter and brown sugar.", "Add egg and vanilla; beat until fluffy.", "Stir together flour, baking soda and salt.", "Add to creamed mixture alternately with yogurt.", "Blend well.", "Turn into a greased 9-inch square cake pan.", "The top can be sprinkled with chopped nuts if desired.", "Bake in a 350\u00b0 oven for about 35 to 40 minutes or until a toothpick inserted in the center comes out clean."]
["butter", "brown sugar", "egg", "vanilla", "flour", "baking soda", "baking powder", "salt", "yogurt"]