1. Crust: Heat oven to 425°F. Coat deep 9-in. pie pan with cooking spray. Arrange potato slices in bottom and up sides of pan, overlapping slightly, to form crust. Spray potatoes with cooking spray. Bake in 425°F oven until potatoes are lightly browned and slightly crisp, 20 to 25 min.
2. Meanwhile beat eggs, cream, basil, oregano, salt and pepper in medium bowl until blended.
3. Remove crust from oven. Reduce oven setting to 350°F. Layer tomatoes, green onions, ham and cheese evenly in crust. Pour egg mixture slowly over cheese. Bake in center of 350°F oven until center is almost set but jiggles slightly when pan is gently shaken and knife inserted near center comes out clean, 40 to 50 min. Let stand 5 min. Cut into wedges.
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