1. In a large skillet, heat the olive oil and saute the garlic and onion until tender. Stir in the green beans. Add the lemon juice and stir again. Place a lid on the skillet and cook the green beans until tender, about 5 minutes. Make sure you stir the beans at least once.
2. Pour the green beans into a bowl or onto a serving platter. Top with feta cheese and season with salt and pepper. Serve warm.
*Note-I always squeeze additional fresh lemon juice on the green beans right before serving.