Wrap Tortillas In Aluminum Foil, And Place In Oven. Turn Heat To 350 Degrees F (175 Degrees C). Bake For 15 Minutes, Or Until Thoroughly Heated. In A 10 Inch Skillet, Heat Oil Over Medium High Heat. Add Onions, Red And Green Peppers, And Garlic; Stir To Coat With Oil. Cover, Reduce Heat To Medium, And Cook For 5 Minutes. Stir Squash Into Vegetables. Stir In Salsa, Cumin, And Salt. Cover, And Cook For 5 Minutes. Spoon Vegetable Mixture Evenly Down The Centers Of Warm Tortillas, And Sprinkle With Cheese And Cilantro. Roll Up Tortillas, And Serve.