Heat half of the oil in a nonstick pan on medium heat, saute the chicken sausage, mushrooms, peppers, and red onion until they start to soften. Add in the spinach and saute until it is wilted. Place the mixture on the pita, top with goat cheese and place under the oven broiler for 2 - 3 minutes.
Heat the remaining oil in a nonstick pan on low medium heat. Crack the eggs into the pan and cook until the whites are set and no longer runny, about 4 - 6 minutes. Season with salt and pepper.
Cut the pita into quarters, serve with eggs and watermelon.