Add butter or margarine, onion, and zucchini to a skillet and cook until slightly tender.
Add spices.
Mix the beaten eggs and the Mozzarella cheese in a bowl.
Add the cooked zucchini mixture to the eggs and cheese and mix together.
Line a 10 inch pie plate with the can of crescent rolls and spread 2 tsp. mustard over the crust.
Pour the mixture into the pie plate and bake at 375 degrees for 18 to 20 minutes.
Let stand for 10 minutes before serving.
Notes
You may have to cover the crust with strips of aluminum foil during the last few minutes of baking to avoid overbrowning.Adapted from a recipe by Ron Horne