2 tablespoons extra-virgin olive oil
2 tablespoons minced onion
1/2 cup diced yellow summer squash
1/2 cup diced zucchini
1/2 cup corn kernels, preferably fresh
1 jalapeño, stemmed, seeded and finely chopped
1/2 cup diced tomato or quartered cherry tomatoes
1/4 teaspoon dried oregano
salt
1/2 cup Monterey Jack cheese, grated
8 corn tortillas
1 tablespoon minced cilantro.