Preheat the oven to 400º Fahrenheit. Light grease a large baking sheet with cooking spray. Set aside.
Heat butter and olive oil in a large sauté pan. Whisk in honey, brown sugar, and salt over medium heat. Continue to whisk until the sugar and honey have dissolved, and the glaze has thickened. About 5 minutes.
Add baby carrots and toss well to make sure they are well coated. Simmer for 1-2 minutes.
Transfer the carrots onto the baking sheet and roast until fork-tender. About 20 minutes. Reserve the remaining liquid in the pan.
5 minutes before the carrots are done roasting, reheat the honey-sugar glaze. Keep on a low simmer. Once done roasting, transfer the carrots back into the skillet. Toss well in the glaze and serve immediately. If desired garnish with fresh parsley.