Cook Mozzarella Sticks according to package directions.
Meanwhile, heat oil in a large saucepan set over medium-high heat; cook beef, onion, chili powder, salt and pepper for 6 to 8 minutes or until beef starts to brown and onion is softened.
Stir in tomato paste; cook for 1 minute.
Stir in diced tomatoes, kidney beans, and Worcestershire sauce; bring to simmer. Cook for 20 to 25 minutes or until thickened.
Serve Mozzarella Sticks in mini hot dog buns; spoon chili over top.
Substitute canned chili for homemade if desired. Freeze remaining chili for another easy meal.