01 -
Preheat the oven to 200°C.
02 -
Toss the green beans, cherry tomatoes, and diced onions with olive oil, salt, and black pepper until evenly coated.
03 -
Spread the vegetable mixture on a baking sheet in a single layer and roast in the oven for 20 to 25 minutes until tender and lightly caramelized.
04 -
Boil the potatoes until fork-tender, then drain thoroughly.
05 -
Combine the boiled potatoes with butter, milk, and garlic powder; mash until smooth and creamy.
06 -
Plate the roasted green bean and tomato medley alongside the garlic mashed potatoes for serving.