Mushroom and Feta Breakfast Casserole

Name: Mushroom and Feta Breakfast Casserole
Prep time: 20 min
Cook time: 35 min
Total time: 55 min
Cuisine: European, Mediterranean, Greek
Ingredients: 12 eggs; 1 T half and half (Probably optional, but I usually use it if I have some in the house.); 1 pound, washed and sliced mushrooms (see notes); 2 tsp. olive oil (or more, depending on your pan); 1 cup crumbled Feta cheese; 1/3 cup sliced green onions (optional, but good); 1 tsp. Spike Seasoning, or use any all-purpose seasoning blend that’s good on eggs; fresh ground black pepper to taste