Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 425 degrees. Lightly oil a baking sheet. Wash and dry all produce. Dice potatoes into 1/2-inch pieces. Trim and discard woody bottom ends from asparagus. Finely chop chives. Place 1 TBSP butter (2 TBSP for 4) in a medium microwave-safe bowl; microwave until melted, 30 seconds. Stir in panko, half the Fry Seasoning, half the cheddar (you’ll use the rest of the seasoning and cheese later), salt, and pepper.

Pat chicken dry with paper towels; season with remaining Fry Seasoning, salt, and pepper. Place on one side of prepared sheet (for 4 servings, spread out across entire sheet). Evenly spread a thin layer of mayonnaise onto tops of chicken (you might not use all the mayo); mound with panko mixture, pressing to adhere (no need to coat the undersides). Roast on top rack for 5 minutes (you’ll add the asparagus then).

While chicken roasts, place potatoes in a large pot with enough salted water to cover by 2 inches. Bring to a boil and cook until tender, 15-20 minutes. Reserve 1/2 cup potato cooking liquid, then drain and return potatoes to pot. Meanwhile, place bacon in a large, dry pan over medium-high heat. Cook, turning occasionally, until crispy, 6-10 minutes. Turn off heat; transfer to a paper-towel-lined plate. Once bacon is cool enough to handle, roughly chop.

Once chicken is lightly browned, remove sheet from oven. Carefully toss asparagus on empty side with a drizzle of olive oil, salt, and pepper. (For 4 servings, leave chicken roasting and add asparagus to a second sheet; roast on middle rack.) Continue roasting until asparagus is tender and chicken is cooked through, 10-12 minutes more. TIP: For a deeply golden crust, broil chicken for the last 2-3 minutes.

To pot with drained potatoes, add sour cream, remaining cheddar, and 1 TBSP butter (2 TBSP for 4 servings). Mash until smooth and creamy, adding splashes of reserved potato cooking liquid as needed. Stir in half the bacon and half the chives. Season with salt and pepper.

Divide chicken, potatoes, and asparagus between plates. Top potatoes with remaining bacon and chives. Serve.