Preheat oven to 425°F (220°C).
Place the chicken breast-side down on a cutting board.
Use kitchen shears to cut along both sides of the backbone and remove it.
Flip the chicken over and press firmly on the breastbone to flatten it.
Pat the chicken dry with paper towels.
Rub olive oil all over the chicken.
Season evenly with salt, black pepper, paprika, garlic powder, and dried thyme.
Place the chicken skin-side up on a baking sheet or roasting rack.
Roast in the oven for about 40–45 minutes until the skin is crispy.
Check that internal temperature reaches 165°F (75°C).
Remove from oven and let the chicken rest for 10 minutes.
Drizzle with lemon juice, garnish with parsley, and serve.