In a large skillet, cook the beef over medium heat until no longer pink; drain. Stir in the beans, chilies, oregano, cumin and salt. Cook over medium-low heat for 3-4 minutes or until heated through. , Brush one side of each tortilla with butter. Spoon 1/2 cup of the meat mixture over half of unbuttered side. Sprinkle with 1/3 cup cheese; fold in half. , Place on a lightly greased baking sheet. Sprinkle with paprika. Bake at 475° for 10 minutes or until crisp and golden brown. Cut into wedges.