Melt lard or butter in cast iron skillet over medium heat.
Add onion and minced garlic and cook until onion just starts to be limp, about 5 minutes.
Add sliced zucchini and green chiles and cook until zucchini begins to turn soft.
Add frozen corn and cook until zucchini is tender and corn is cooked.
Sprinkle with salt and parmesan cheese and serve.