Melt butter over medium heat. Saute onion for 5 minutes.
Add in spinach. Cook for 1 1/2 minutes.
Add in garlic. Saute for 30 seconds. Lower the heat to low and stir in roasted red pepper, goat cheese, and 1/2 of the cheddar cheese. Season with salt, to taste. Set aside.
Whisk together 4 eggs and milk. Season with a touch of salt and pepper. Because we’ve already salted our veggie/cheese mixture.
Stir together the egg and milk mixture with the veggie/cheese mixture.
Preheat oven to 375 degrees F.
Grease a pan with cooking spray. I used an 8 in cheesecake pan, because I don’t have a pie tin ;)
Bake for 15 minutes and then sprinkle with the rest of the cheddar cheese on.
Bake for another 15 - 25 mins, or until the egg mixture has set. You can set this with a toothpick. Or you can see once the egg mixture isn’t jiggly. The time will vary depending on the size of your pan.