1 large onion, chopped
1 tbsp. vegetable oil
1 (10-oz.) pkg. frozen chopped spinach, thawed and pressed dry
5 eggs, beaten
3 c. (12-oz.) shredded Muenster cheese
1/4 tsp. salt
1/8 tsp. pepper

Sauté onion in oil until tender. Add spinach and cook until excess moisture evaporates; cool. Combine remaining ingredients and stir into spinach mixture. Pour into a greased 9-inch pie plate.

Bake at 350°F for 30 minutes or until set.