Pre-heat oven to 400 F and arrange the rack in the middle of the oven
Heat a 10 inch cast iron skillet on medium high heat, then add the oil and put in the zucchini.
Cook for 2-3 minutes and then add bell pepper and spinach. Sauté till all vegetables are cooked through.
Add the chili flakes, Italian seasoning, and salt & pepper to the vegetables. Give it a good stir, taste the veggies for salt and add more seasoning if you like.
Lower the heat, Spread the veggies into an even layer and sprinkle the feta cheese on top.
Whisk the eggs into a bowl add a pinch of salt and a bit of pepper. Then pour the eggs on top of the vegetables and move the pan around to make sure the egg is covering all the veggies.
Cook eggs on stove for about 30 seconds to a minute just till the edges of pan are set. Then put the pan in the oven and cook till eggs are set 8-10 minutes. If you cook it in a toaster oven then it will take about 5 minutes.
Let the eggs cool in the pan for a few minutes and serve for breakfast, lunch, or dinner.