Add the spinach, warm for 2 minutes.
In a separate bowl, beat the eggs, yogurt, and flavoring. Mix well.
Include the peppers and the onion blend. Mix.
Crumble the feta cheddar with a fork, add it to the frittata.
Coat the base and sides of a round baking dish with butter. Pour the egg mixture into the dish. Wrap aluminum foil around outside of dish to cover completely.
Pour water into the pot of your pressure cooker. Set your pressure cookers steamer rack over the water. Gently lay the pan onto the rack.
Seal lid on pressure cooker and turn the steam valve to Sealing. Select Pressure Cook to High Temperature, press
Pressure Level to choose High Pressure, and use the “+” and “-” buttons to adjust cook time to 10 to 15 minutes.
Once the cycle has completed, turn the steam valve to Venting to Quick Release pressure.