Pre-heat oven to 425 degrees Fahrenheit.
Grease a 913 baking pan with butter, coconut oil or cooking spray.
Place chopped onion, peppers, zucchini, garlic in a large bowl. Drizzle with avocado oil and season with salt and pepper. Toss everything together and transfer the veggies onto a rimmed baking sheet. Bake for 30 minutes, flipping the vegetables half way through.
Remove veggies from the oven and allow to cool. Reduce cooking temperature to 350 degrees farenheit.
Meanwhile, in a large bowl, whisk together eggs, milk, salt and pepper.
Add cooled veggies to the egg mixture and transfer into prepared pan and top with dots of goats cheese and sliced scallions.
Pop in the oven and bake for 30 minutes or until the eggs have puffed up and are set through the center. Serve and enjoy!