1. Preheat oven to 350 degrees F.
2. Prepare muffin tin by spraying generously with cooking spray.
3. Crumble feta cheese in bottom of each well, top with spinach, tomatoes, and onions.
4. Beat the eggs, half and half and garlic together and pour over each.
5. Bake 20-25 minutes til tests done (knife inserted comes out clean).