• Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 425 degrees. Wash and dry produce. • Trim, peel, and cut carrots on a diagonal into 1⁄2-inch-thick pieces. Trim and halve zucchini lengthwise; slice crosswise on a diagonal into 1⁄2-inch-thick half-moons.

• Toss carrots and zucchini on a baking sheet with a large drizzle of oil, half the garlic powder, half the thyme, salt, and pepper (for 4 servings, spread carrots out across entire sheet; use a second sheet for zucchini). (You’ll use the remaining garlic powder and thyme in Step 5.) • Roast on top rack, tossing halfway through, until browned and tender, 20-25 minutes. (For 4, roast on top and middle racks, swapping rack positions halfway through.)

• While veggies roast, pat chicken* dry with paper towels and season all over with salt and pepper. • Heat a drizzle of oil in a large pan over medium heat. Add chicken; cook until browned and cooked through, 6-8 minutes per side. TIP: Lower heat and cover pan if chicken begins to brown too quickly. • Turn off heat; transfer to a cutting board. Wipe out pan. Swap in steak* for chicken. Cook to desired doneness, 5-7 minutes per side.

• Meanwhile, trim and thinly slice mushrooms (skip if your mushrooms are pre-sliced!). • In a small bowl, whisk together mustard, sour cream, stock concentrate, 1⁄4 cup water, and 1 tsp vinegar (1⁄3 cup water and 2 tsp vinegar for 4 servings). (Be sure to measure the vinegar; we sent more.) Set aside.

• Heat a drizzle of oil in pan used for chicken over medium-high heat. Add mushrooms and remaining thyme; season with salt and pepper. Cook, stirring occasionally, until softened, 2-4 minutes. Add remaining garlic powder and stir to coat. • Add mustard mixture and 2 TBSP butter (4 TBSP for 4 servings). Cook, stirring constantly, until butter has melted and sauce is thoroughly combined. • Bring to a simmer and cook, stirring constantly, until slightly thickened, 1-2 minutes more. TIP: If sauce is too thick, add a splash or two of water and bring to a boil; stir until smooth and slightly thickened. • Turn off heat and season with salt and pepper.

• Thinly slice chicken crosswise. • Divide chicken and veggies between plates. Spoon mushroom sauce over chicken and serve. Thinly slice steak against the grain. Steak is fully cooked when internal temperature reaches 145°.