Fancy Vegetable Medley

1 cup onion, thinly sliced
2 tbsp butter
2 cups carrots, diagonally sliced
4 cups broccoli, stems thinly sliced and florets, 1 inch long
1 tsp basil
1/2 tsp garlic powder
1/2 tsp salt, or less
dash pepper

Saute onion in butter until transparent. Add carrots; saute 5 minutes before adding broccoli stems and pieces. Saute 2 minutes more, then add florets and seasonings. Cover; let simmer in own juices for 3-5 minutes.