Heat olive oil in a large skillet over medium-high heat. Add garlic to pan; sauté 30 seconds, stirring constantly. Add potato, celery, salt, and beans; sauté 1 minute. Add 1/4 cup water; cover and cook 5 minutes or until beans are crisp-tender. Add cilantro and tomatoes. Cover, reduce heat, and cook 4 minutes or until tomatoes begin to soften, stirring occasionally. Stir in peppers.