Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Peel the swede and cut it into uniform 1-inch cubes to ensure even roasting.
Slice the chicken breast into bite-sized pieces, roughly the same size as the swede cubes.
In a large mixing bowl, whisk together the olive oil, honey, Dijon mustard, sea salt, black pepper, and garlic powder.
Add the swede cubes and chicken pieces to the bowl, tossing thoroughly until every piece is coated in the glossy glaze.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring the pieces are not overcrowded.
Bake for 25 to 30 minutes, tossing halfway through the cooking time, until the swede is fork-tender and the chicken is golden brown.
Remove from the oven and sprinkle with finely chopped fresh rosemary for a fragrant, clean-eating finish.