Heat olive oil in a large nonstick skillet over medium-high heat. Add garlic; sauté 1 minute. Add celery, pepper, and chicken; cook 6 minutes or until mixture is heated through. Add tomatoes and broth; bring to a simmer. Cook 8 minutes. Sprinkle with cheese.
Tip: Gorgonzola is a type of blue cheese. You can substitute crumbled feta or goat cheese, if you prefer.