• Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 450 degrees. Bring garlic herb butter to room temperature. Wash and dry produce. • Dice potatoes into 1/2-inch pieces; toss on one side of a baking sheet with a drizzle of oil, salt, and pepper. (For 4, spread potatoes out across entire sheet.) • Peel garlic. Place whole cloves in the center of a small piece of foil. Drizzle with oil; season with salt and pepper. Cinch into a packet and place on same sheet. • Roast on top rack until potatoes are browned and tender and garlic is softened, 20-25 minutes. (You’ll add more to the sheet after 15 minutes.)

• Trim and discard woody bottom ends from asparagus. • Gather asparagus into four even bundles (eight bundles for 4 servings) on a clean work surface. Starting 1 inch from the bottom of the spears, roll up each bundle in a slice of prosciutto, so that the prosciutto covers as much length as possible. TIP: Tug the prosciutto a little as you wrap to keep it tight around the asparagus.

• Once potatoes have roasted 15 minutes, remove sheet from oven. Carefully place wrapped asparagus on empty side. Roast until asparagus are tender and prosciutto is crispy on the bottom, 10 minutes. (For 4 servings, leave potatoes and garlic roasting; add asparagus to a second sheet and roast on middle rack.) • Remove sheet from oven; flip wrapped asparagus. Return to oven until crispy all over, 2-4 minutes more.

• Meanwhile, pat chicken* dry with paper towels; season generously all over with salt and pepper. • Heat a drizzle of oil in a large, preferably nonstick, pan over medium-high heat. Add chicken and cook until browned and cooked through, 3-5 minutes per side. • In the last 2 minutes of cooking, reduce heat to low; add half the garlic herb butter (all for 4 servings) to pan. Spoon over chicken until coated. Turn off heat; leaving butter in pan, transfer chicken to a cutting board. Tent with foil to keep warm.

• While chicken rests, carefully transfer garlic to a cutting board and mash cloves with a fork until smooth. • Heat pan used for chicken over medium-high heat. Stir in demi-glace and 1/4 cup water (1⁄3 cup for 4 servings); simmer until slightly thickened, 2-3 minutes. Turn off heat. • Stir in crème fraîche and garlic. (TIP: If sauce seems too thick, add water 1 tsp at a time until it reaches a drizzling consistency.) Season with a pinch of salt and pepper if desired.

• Divide chicken, wrapped asparagus, and potatoes between plates. Drizzle chicken with as much sauce as you like. Serve with any remaining sauce on the side for dipping. Chicken is fully cooked when internal temperature reaches 165°.