Combine chicken, picante sauce, onion, cumin, oregano, and salt in saucepan, and simmer 5 mins.

Brush one side of tortillas with butter. Spoon 1/3 cup of chicken mixture onto center of unbuttered sides, then top with 2 tbsp. cheese. Fold 2 sides over filling, fold ends down.

Place seam side down in 13"x9"x2" baking dish. Bake in preheated oven at 475 about 13 minutes or until crisp golden brown. Top with additional picante sauce and serve.