Ham, Mushroom, & Cheese Frittata

INGREDIENTS
8 eggs
2 Tablespoons milk
3/4 cup shredded cheddar, divided
1/4 cup grated Parmesan
1/2 cup ham, diced
1/2 cup mushrooms, diced
1/4 onion, diced
1 teaspoon butter
Salt & pepper to taste

DIRECTIONS
1 - Preheat oven to 350 degrees. Melt butter over medium heat; saute onions and mushrooms until tender. Remove from heat and set aside.
2 - Beat eggs & milk together. Add 1/2 cup shredded cheddar, Parmesan, ham, mushrooms, onions & salt/pepper.
3 - Coat a pie pan with cooking spray and add egg mixture.
4 - Bake at 350 degrees for 20 minutes. Top with remaining cheddar cheese and return to oven for 10 minutes. Allow to settle and cool 5 minutes before serving.