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Put a tortilla on a plate, covered with a damp paper towel. Alternate tortillas with paper towels. Microwave for 30 seconds to one minute, depending on how many tortillas. Preheat the oven to 250 degrees. Wrap a stack of tortillas in a damp dish towel and place in a casserole dish of similar size. Cover with a lid or a piece of aluminum foil tightly on the dish. Place in oven for 20 minutes. Once the tortillas are heated, transfer them to a tortilla warmer to keep them nice and hot.
In a large bowl, combine the zucchini, corn, onion, jalapenos, beans, salt, pepper, and chili powder. Toss gently to distribute the seasonings and then stir in the cheese. Heat the oven to 200 degrees F. Set the tortillas on a work surface. Put about 1/3 cup of the filling on one half of each tortilla.