Add 1 tbsp. of olive oil. Sauté the peppers, mushrooms and onions until tender (around 4 minutes). Add the spinach and sauté for 1 more minute. Turn off the electric skillet.
In a bowl, beat the eggs. Add the sautéed vegetables, salt and pepper.
Grease a small cast iron pan and pour the egg mixture in.
Add the goat cheese in chunks, scattered throughout the pan.
Clean the electric skillet and bring it to 375ºF again.
Place a small baking rack inside electric skillet (to use like an oven). Place the cast iron pan on top of the baking rack, cover the skillet with the lid and bake for 30 minutes, or until cooked through.