Fry mushrooms, green pepper and onion and cook about four minutes then drain and set aside.
Whisk eggs and milk until blended. Add ham, vegetable mixture, spinach, salt and pepper.
Divide mixture equally between four 8-ounce mason jars.
Place rack in your Instant Pot and add one cup of water. Place jars on rack.
Cook on high pressure 10 minutes. Allow pressure to decrease on its own.
Per Serving (excluding unknown items): 259 Calories; 17g Fat (60.3% calories from fat): 20g Protein; 5g Carbohydrate; 1g Dietary Fiber; 451mg Cholesterol; 859mg Sodium, Exchanges: 0 Grains (Starch); 2 ½ Lean Meat; 1/2 Vegetable; 0 Non-Fat Milk; 1 ½ Fat.