BARS: Preheat oven to 350. Grease a 9 x 13" pan. Cream butter & sugar until fluffy. Add eggs, one at a time. Stir in vanilla, flour & baking powder. Mix thoroughly. Stir in coconut, zucchini and walnuts. Spread evenly in a well greased 9 x 13" pan and bake on 350 for approximately 40 minutes. Frost while still warm.