Heat the oil in a large cast-iron skillet over medium heat. Add the milk and diced tomatoes and cook, stirring constantly, until thickened, about 3 minutes. Garnish the casserole with tomato, red onion, jalapeño, and cilantro, if using. Also, if your family is a fan of spicy foods, feel free to add half a minced jalapeño along with the garlic and onion for a pop of heat. *Vegan Substitution: Omit the shredded mozzarella and milk and replace with your favorite vegan cheese and milk alternatives.
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