Heat oil in small fry pan. Add red onion and mushroom. Cook for 2-3 minutes and remove from heat.
Place grated cheese in bottom of greased pie plate.
Then place the spinach, red pepper, turkey, cooked onion and mushrooms. Set to the side.
In a bowl, whisk the milk, eggs, salt, pepper, and nutmeg.
Pour the egg mixture evenly ontop of the cheese and veggies.
Place quiche into a 350 F degree oven. Bake for 45-50 minutes.
You will know it is cooked when the middle does not look liquidy and a knife comes out clean. Take it out of the oven and let it sit for 5 minutes. Then enjoy!