Preheat your oven to 400°F (200°C).
Prepare the vegetables by peeling and cutting the beets and carrots.
In a large mixing bowl, combine beets, carrots, olive oil, honey, salt, and pepper. Toss until well coated.
Spread the vegetables in a single layer on a baking sheet.
Roast in the oven for about 30-35 minutes, stirring halfway through.
Check for doneness; they should be tender when pierced with a fork.
If desired, sprinkle with fresh thyme just before serving.