Preheat the oven to 400°F.
Wash and peel the rainbow carrots. Cut them into uniform sticks or rounds to ensure even roasting.
In a large bowl, toss the carrots with olive oil, honey, maple syrup, salt, black pepper, and dried thyme until evenly coated.
Spread the carrots on a baking sheet lined with parchment paper in a single layer.
Roast the carrots in the oven for about 25-30 minutes, stirring halfway through, until they are tender and slightly caramelized.
While the carrots are roasting, season the chicken breast with a pinch of salt, pepper, and extra thyme if desired.
Heat a grill pan or skillet over medium-high heat and cook the chicken breast for about 5-6 minutes per side, or until fully cooked and juices run clear.
Slice the chicken breast into strips.
Plate the roasted carrots alongside the sliced herbed chicken, and serve warm.