Preheat the oven to 350 degrees F.
Begin by cooking the spinach and zucchini. To do so, add the oil, spinach, and sliced zucchini to a 10-inch cast iron skillet over medium-high heat and cover.
Cook, stirring occasionally until spinach has wilted, about 2 minutes.
Add the sun-dried tomatoes and a sprinkle of sea salt. Continue cooking, uncovered, until zucchini has some golden-brown color to it.
Pour the egg mixture into the cast iron skillet over the vegetable mixture and use a wooden spoon to distribute the vegetables evenly. Sprinkle on the goat cheese.