1. Preheat the oven to 375°F (190°C). Cut the tomatoes in half, horizontally, and place them cut-side down on a baking sheet lined with parchment paper.
2. Drizzle the olive oil over the tomatoes and sprinkle with garlic powder, salt, and pepper. Toss to coat.
3. Roast the tomatoes in the oven for 45 minutes to an hour, or until they are soft and caramelized.
4. While the tomatoes are roasting, cook the French green beans in boiling water for 2-3 minutes, or until they are tender but still crisp. Drain and rinse with cold water.
5. In a large bowl, combine the roasted tomatoes, crumbled feta cheese, cooked French green beans, chopped basil, and chopped oregano. Toss to coat.
6. Season the salad with salt and pepper to taste. Serve warm or chilled.
### Tips:
* For the best flavor, use ripe tomatoes that are slightly soft to the touch.
* Don't skip the step of salting the French green beans before cooking. It enhances their natural sweetness and brings out their flavor.
* This salad is a great make-ahead dish for picnics or potlucks. Simply prepare the tomatoes and French green beans ahead of time, then assemble the salad just before serving.
Enjoy your delicious slow roasted tomato salad with feta and French green beans!