Preheat the oven to 400 degrees F (200 degrees C). Grease a 9x13-inch baking dish with olive oil-flavored cooking spray.

Place bell pepper halves open side up in the prepared baking dish. In a medium bowl, toss together cherry tomatoes, basil, and garlic. Fill each pepper half with a handful of mixture. Season with salt and pepper. Cover the dish with aluminum foil.

Bake for 15 minutes in the preheated oven, then remove the aluminum foil and continue baking for an additional 15 minutes. Remove from the oven, and sprinkle with herb vinegar. These are equally good served hot or cold.