In A Large Skillet, Saute The Zucchini, Onion And Garlic In Butter Until Tender; Set Aside. In A Large Bowl, Whisk The Eggs, Parmesan Cheese, Parsley, Basil, Marjoram And Salt. Stir In Zucchini Mixture And Monterey Jack Cheese. Pour Into A Greased 1-Qt. Baking Dish. Bake At 350 Degrees F For 20-25 Minutes Or Until A Knife Inserted Near The Center Comes Out Clean. Let Stand For 5 Minutes Before Serving.