In 10-inch cast-iron or other ovenproof skillet, heat 1 teaspoon olive oil over medium heat. Add ground beef and onion. Brown all over, breaking up meat as you go. Once meat is browned and onions are soft, add tomato paste and crushed tomatoes. Stir it all up, and then stir in the chili seasoning mix, Worcestershire sauce and pinto beans. Heat to a simmer, and cook about 5 minutes or until sauce has thickened and is bubbling. Remove from heat.