Mushroom-Spinach Frittata

Lots of fresh mushrooms, tender spinach leaves and creamy butter makes this dish irresistible.

3 tablespoons butter
1/2 small onion, minced (1/4 cup)
8 ounces fresh mushrooms, sliced
1 1/2 cups fresh spinach leaves, thoroughly washed and chopped
8 eggs, well beaten
Salt
Freshly ground pepper
1/4 cup freshly grated Parmesan cheese







Melt butter in a large cast iron or ovenproof skillet over medium-low heat. Add onions and cook 3 minutes. Stir in mushrooms and cook until limp. Add spinach and cook another 2 minutes. Pour eggs on top of spinach in skillet; cook over low heat until eggs are set, 6 to 8 minutes. Sprinkle with salt and pepper. Place skillet under broiler about 6 inches from heat source for 2 to 3 minutes. Remove from oven. Sprinkle top with Parmesan cheese; cover and allow to stand 2 minutes before serving.