Frittata (Basic Pasta and Cheese) - With greens

3 large potatoes , I suggest Yukon but all purpose is fine, sliced 1/4 thick and then in half 2 vidalia onions (not in rings though) or 2 sweet onions ,[...]

10 eggs 1 teaspoon salt 1 1/2 tablespoons unsalted butter 2 -3 small zucchini , sliced 1/8 inch thick 2 tablespoons fresh oregano leaves 2 teaspoons chopped[...]