Created by JoanWagnerTeller on February 23, 2020
Step 1: Heat oil in 10" skillet over medium heat, then sauté mushrooms and onions.
Step 2: Beat together the eggs, salt, and pepper.
Step 3: Stir in the sautéd mushrooms and onions, adding the well-drained spinach.
Step 4: With the skillet hot, pour in the egg-vegetable mixture.
Step 5: Reduce heat to medium low and cook about 10 minutes, covered, till top is fairly set and bottom nicely brown.
Step 6: Tipping skillet, slide pie out onto plate.
Step 7: Hold plate on bottom and invert skillet over plate.
Step 8: Quickly turn skillet right side up again, return to heat, and remove plate.
Step 9: Fry uncovered until second side is brown--about 10-15 minutes more. [Optional method: Cook without flipping on low heat about 20-25 minutes or until set.]
Step 10: Preheat broiler. Top frittata with cheese and broil 6" from heat about 1 minute or until cheese is brown.
Step 11: Garnish with pepper rings (optional).