
Heat the olive oil in a large skillet or sauté pan over medium-high heat.
Add the onion, poblano, and jalapeño. Cook for 5 minutes, stirring occasionally, until the vegetables begin to soften.
Add corn and tomatoes, and cook for 5 more minutes, stirring occasionally.
Add the zucchini, yellow squash, garlic, salt, black pepper, oregano and ground cumin. Stir to combine and cook for 5 minutes, stirring every minute or so.
Pour in the water, reduce the heat to low, cover, and simmer for 5 minutes.
Stir in the shredded cheese and milk until the cheese has fully melted.
Remove from the heat, garnish with a sprinkling of cotija cheese and cilantro, and serve.