Heat the oven to 375º degrees.
On a baking sheet, toss together the carrots, olive oil, and ½ cup of water. Roast the carrots until they’re tender and lightly browned, about 35 to 40 minutes, turning once halfway through cooking.
In a medium saucepan, heat the butter, apple cider vinegar, tablespoon of water, honey, salt, garlic powder, dried mustard, and thyme over low heat, whisking until slightly thickened, 1 to 2 minutes.
Transfer the roasted carrots to the saucepan and toss with sauce until evenly distributed. Transfer to a serving platter and serve hot.