Preheat oven to 425.Spread green beans, tomatoes, and garlic on baking sheet.Sprinkle with salt and freshly ground black pepper.Drizzle olive oil over all.Using hands, mix vegetables and olive oil until beans and tomatoes are lightly coated.Roast for 15-20 minutes, until green beans are just starting to brown and tomatoes are starting to pop.Serve hot or room temperature.