Saute onion and zucchini in butter until tender/crisp. Add spices. Combine eggs and cheese; fold in zucchini mixture. Unfold crescent rolls and line bottom and sides of 10" pie plate. Spread crust with mustard. Pour vegetable mixture into crust. Bake in preheated 350 degree oven for 18-20 minutes. Cover crust with foil after ten minutes. Let stand for 10 minutes before serving.