Preheat oven to 425 degrees
Clean and halve the brussel sprouts
Toss the brussel sprouts in olive oil and liberally sprinkle the garlic powder all over the sprouts as you toss them in the oil
Baking Tray: cover the tray with parchment paper or non-stick foil to make clean up easier.
Spread the spouts out over the baking tray.
Sprinkle salt (and more garlic powder if you want) over the spouts.
Bake in the oven for 25-40 minutes (they should be golden, and possibly crispy if that is how you like them.)
While the sprouts bake, make the glaze.
Melt butter in a small pot.
Saute onions over low-medium heat in the butter until soft (5-10 minutes). You can sprinkle a dash of salt over the onions. If the onions get dry, you can add more butter or olive oil or a spoon of water. After 5 minutes, you can add the optional prosciutto, and optional thyme otherwise, cook the onions alone for another 5 minutes.When the onions are soft and golden, pour in the balsamic vinegar. Cook the glaze for 3-5 minutes until it thickens a bit.
Toss the roasted sprouts in the glaze and serve.
Enjoy!