Preheat oven to 400 degrees and spray a 9" pie plate or tart pan with nonstick cooking spray.
Cook potatoes and onion in a skillet over medium high heat for 10 minutes, stirring frequently. Spread in the bottom of the pie plate. Sprinkle with cheese, bell pepper, green onions and zucchini.
In a medium bowl, beat together remaining ingredients and pour into pie plate. Bake for 30-40 minutes or until eggs are set in the center.