Step 1Heat a large skillet over medium heat. When it's hot, add the oil, then the onion, garlic and jalapeno. Cook, stirring frequently, until the onions are translucent, 3 to 5 minutes.
Step 2Stir in the tomatoes and increase the heat to medium-high. Cook about 5 minutes, stirring frequently, until the tomatoes begin to break down.
Step 3Stir in the zucchini, corn, salt and pepper. Cover and cook, stirring occasionally until the vegetables are just tender, about 7 minutes. Remove from heat and check the seasoning.
Step 4Place the vegetables in a serving bowl, sprinkle with the cheese and serve immediately.