Spinach and Onion Frittata

1/2 pound spinach, rinsed well and chopped
1 tablespoon cooking oil
3/4 cup thinly sliced onion
1 clove garlic, minced
8 eggs
2 tablespoons milk
1/4 cup parmesan cheese
2 tablespoons sun dried tomatoes or roasted red peppers (optional)
3-4 oz soft cheese like goat cheese or homemade kefir or yogurt cheese
salt and pepper to taste

Saute onion in oil over medium heat until translucent, about 10 minutes.  Add spinach to wilt down.  Remove from heat and set aside until cooled.  Meanwhile mix together garlic, eggs, milk, cheeses, and optional tomatoes or peppers.  When cool enough to touch with your hand add onion and spinach mixture, salt and pepper.  In a clean skillet, heat to medium and then pour egg mixture in.  Cook on medium-low until the top is set, shaking the pan and running a spatula around the sides frequently to prevent sticking.  When the top is set, place under broiler for a minute or two to brown.  Watch carefully as to not burn!  Serve hot or cold.  Great leftover as well!