01 - Preheat the oven to 425°F. Line a baking sheet with parchment paper.
02 - Toss the rainbow carrots with olive oil, salt, black pepper, honey if using, and thyme. Arrange in a single layer on the prepared baking sheet.
03 - Roast the carrots for 25 to 30 minutes, turning once halfway through, until tender and lightly caramelized.
04 - Season the chicken breasts with salt, black pepper, and smoked paprika.
05 - Heat 1 tablespoon olive oil and 1 tablespoon butter in a large skillet over medium-high heat. Add the chicken breasts and sear for 5 to 6 minutes per side, until golden and just cooked through. Remove chicken to a plate and cover loosely with foil.
06 - Reduce heat to medium. Add remaining 2 tablespoons butter to the skillet. Stir in the minced garlic and cook for 1 minute, until fragrant.
07 - Add lemon zest, lemon juice, and chopped parsley. Return chicken to the skillet, spooning the garlic butter sauce over the top to coat.
08 - Serve the garlic butter chicken with roasted rainbow carrots. Garnish with extra parsley if desired.