In saute pan, melt better. Add zucchini and onion and saute until soft. Add seasonings and salt and pepper. In large bowl combine beaten eggs and cheese. Stir in zucchini mixture.
Unwrap crescent rolls. Line a 13 x 9 inch glass baking dish with the crescent rolls, pressing on bottoms and up sides of dish. Spread with mustard. Pour zucchini mixture into prepared dish. Bake in preheated oven at 350 degrees for 20 minutes. If crust is browning before center is cooked cover with foil. Remove from oven and let stand 20 minutes. Cut into squares and serve.