Layer phylo dough in pie plate brushing with melted butter.
Spread with mustard.
In a large skillet, saute
zucchini and onion in butter until tender. In a large bowl, combine the eggs,
cheeses, seasonings and zucchini mixture. Pour into crust.
Bake at 375* for 20-25
minutes or until a knife inserted near the center comes out clean. Cover edges
loosely with foil if crust browns too quickly.