Preheat oven to 375F. Grease or line a sheet pan with parchment paper.
Peel the carrots, cut them in half crosswise and then into strips lengthwise.
In a large bowl combine the olive oil, salt, pepper, thyme and onion. Add the carrots and toss to coat.
In a small bowl mix together the water and the vegetable bouillon.
Place the carrot mixture on the prepared sheet pan, pour the water/bouillon over top and cover tightly with aluminum foil.
Bake for 40 minutes, until the carrots are just tender. Remove the foil and bake an additional 10 minutes.
Transfer to a serving dish and garnish with fresh parsley.