In a large bowl, combine the juice of one lemon, minced garlic, olive oil, fresh thyme leaves, honey, and sweet paprika; whisk until smooth.
Season the marinade generously with salt and pepper, then add the chicken thighs and toss with tongs to coat each piece evenly.
Let the chicken marinate for at least 30 minutes at room temperature, or cover and refrigerate for a few hours or overnight for more flavor.
Preheat the oven to 400°F (200°C).
Arrange the marinated chicken thighs skin-side up in a 9×13-inch casserole dish without overcrowding; tuck lemon slices from the second lemon among the thighs.
Bake for 35–40 minutes, until the chicken is cooked through and the skin is crispy and an instant-read thermometer reads 165°F (74°C).
Optional: broil on high for 2–3 minutes at the end to further crisp the skin—watch carefully to avoid burning.
Remove from the oven, let rest for a few minutes, and garnish with chopped fresh parsley before serving.