01 - Set oven temperature to 425°F for optimal roasting conditions.
02 - Rub the entire chicken surface with olive oil, kosher salt, and black pepper. Stuff the cavity with lemon halves, smashed garlic cloves, fresh thyme sprigs, and rosemary sprigs.
03 - Secure the legs together using kitchen twine and tuck wing tips underneath the body. Position the chicken breast-side up in a large roasting pan.
04 - Combine halved baby potatoes and carrot sticks in a large mixing bowl. Toss thoroughly with 1 tbsp olive oil, 1/2 tsp salt, and 1/4 tsp black pepper. Arrange the seasoned vegetables around the chicken in the roasting pan.
05 - Place the roasting pan in the preheated oven. Roast for 35 minutes to begin cooking the chicken and root vegetables.
06 - Toss asparagus pieces, sugar snap peas, and halved radishes with a light coating of olive oil, salt, and pepper. Remove the pan from the oven after 35 minutes and add these vegetables around the chicken.
07 - Return the pan to the oven and continue roasting for an additional 20 minutes. The chicken is done when the skin is golden brown and juices run clear when pierced. Verify the internal temperature reaches 165°F at the thickest part of the thigh.
08 - Transfer the roasted chicken to a cutting board. Allow it to rest for 10 minutes to redistribute juices before carving.
09 - Arrange all roasted vegetables on a serving platter. Carve the rested chicken into portions and place atop the vegetables. Garnish generously with chopped fresh parsley and lemon zest immediately before serving.