PREPARE: Preheat the oven to 350˚F. Grease a 8 or 9” pie plate or casserole dish.
COOK THE VEGGIES: In a large skillet, sauté the onion, pepper, and mushrooms in oil until tender. Add the ham and heat for about 3 minutes. Drain any excess moisture from the pan and allow to cool while you prepare the remaining ingredients.
PREPARE THE EGGS: In a large bowl, beat the eggs, then add the cheese and vegetable and ham mixture and stir until well incorporated.
COOK THE QUICHE: Pour the mixture into the prepared dish. Bake for 40-45 minutes or until you can place a knife in the center and have it come out clean.*
Notes
*Cooking times will vary between ovens, check to see if the center is set around 32-35 minutes and continue checking often.