Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Peel the tough outer skin from the kohlrabi using a vegetable peeler and chop the bulb into 1-inch cubes.
Cut the chicken breast into uniform 1-inch pieces to ensure even cooking with the vegetables.
In a large mixing bowl, combine the kohlrabi, chicken, minced garlic, olive oil, dried thyme, sea salt, and black pepper.
Toss the ingredients thoroughly until everything is evenly coated in the oil and seasonings.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring the pieces are not overcrowded.
Roast for 20 to 25 minutes, tossing halfway through, until the chicken is cooked through and the kohlrabi is tender and caramelized.
Remove from the oven and immediately sprinkle with the grated parmesan cheese and chopped fresh parsley.