Adjust racks to top and middle positions and preheat oven to 425 degrees. Wash and dry all produce. Cut potatoes into ½-inch-thick wedges. Trim and peel carrots; slice on a diagonal into ½-inch-thick pieces.

Place 1 TBSP butter (2 TBSP for 4 servings) in a small microwave-safe bowl; microwave until just melted, 30 seconds. Stir in half the Fry Seasoning (you’ll use the rest later), pepper, and a large pinch of salt. Add panko and stir until evenly combined.

Place another 1 TBSP butter (2 TBSP for 4 servings) in a second small microwave-safe bowl; microwave until just melted, 30 seconds. Add maple syrup, mustard, and a pinch of salt; stir until smooth. Reserve 1 TBSP of the mixture (2 TBSP for 4) for brushing onto chicken later.

Toss potatoes on a baking sheet with a large drizzle of olive oil, remaining Fry Seasoning, salt, and pepper. On a separate baking sheet, toss carrots with a drizzle of olive oil, salt, and pepper. Push carrots to one side of sheet.

Pat chicken dry with paper towels; season all over with salt and pepper. Place on opposite side of baking sheet with carrots. Evenly spread reserved maple mustard onto tops of chicken breasts, then mound seasoned panko on top, pressing to adhere (no need to coat the underside).

Transfer chicken and carrots to middle rack and potatoes to top rack. Bake until chicken is golden brown and cooked through and veggies are tender, 20-25 minutes. Divide chicken, potatoes, and carrots between plates. Serve remaining maple mustard on the side.