1 tbsp. (15ml) vegetable oil
1 onion, chopped
1 10-ounce package frozen chopped spinach, thawed and drained
5 eggs, beaten
3 cups (270g) shredded Muenster cheese
¼ (1ml) tsp. salt
¼ (1ml) tsp. ground black pepper
Heat oil in skillet. Saute onions in oil until softened. Stir in spinach, cooking until leaves are very wilted.
In a medium mixing bowl mix together eggs, cheese, salt, and pepper to your liking. Stir in the spinach and onion and pour into a greased pie pan or casserole dish.
Bake at 350 degrees F (175C) for 30-40 minutes, until eggs are set and top is lightly browned. Keep an eye on the dish the last ten minutes of the cooking.
The eggs can burn pretty easily. You may need to adjust your temperature a bit as well; if your oven tends to be overly hot, you might end up with a burnt outer edge and a mushy not-set center.