Pat the chicken thighs dry with paper towels and season both sides with 1 tsp salt, 1/2 tsp black pepper and the smoked paprika. Drying the meat removes surface moisture so the skin (or exterior of the thigh) will brown quickly and develop flavor during searing.

Heat a large heavy-bottomed sauté pan or Dutch oven over medium-high heat. When hot, add 1 tbsp olive oil and sear the thighs skin-side (or presentation-side) down for 4–5 minutes until a deep golden-brown crust forms; flip and brown the other side 2 minutes. Searing at high heat creates the Maillard reaction — those browned bits are concentrated flavor that will season the rice.

Remove the chicken to a plate and reduce heat to medium. Add remaining 1 tbsp olive oil and 1 tbsp butter to the pan. The butter adds richness and helps carry flavor; the oil raises the butter's smoke point so it won't burn.

Add the diced onion and a pinch of salt; sauté until softened and starting to color, about 4–5 minutes. Stirring occasionally releases the onion’s natural sugars and builds a sweet savory base for the rice.

Add the sliced/minced garlic and cook 30–45 seconds until fragrant — do not let it brown. Garlic browns quickly and turns bitter; just gently bloom it to release aromatic oils.

Add the uncooked rice to the pan and stir to coat the grains with the butter/oil and aromatics. Toast the rice for 1–2 minutes; you’ll hear a faint popping and the raw starch smell will fade. Toasting helps the rice hold its shape and gives a nuttier flavor.

Pour in the chicken stock and add the thyme sprigs, remaining 1/2 tsp salt, 1/4 tsp black pepper and optional cayenne. Scrape the browned bits off the bottom of the pan — these deglazed bits dissolve into the liquid and are essential flavor for the finished rice.

Nestle the seared chicken thighs into the rice with the thicker side facing up so the juices flow toward the rice. Bring to a gentle simmer over medium heat; then reduce to low, cover tightly, and cook undisturbed for 18–20 minutes, or until the rice is tender and the chicken reaches 165°F (74°C) internal temperature. Cooking undisturbed lets the rice steam evenly; lifting the lid releases steam and can make the rice gummy.

Once done, remove the pan from heat and let it rest, covered, for 8–10 minutes. Resting lets the steam finish cooking the rice gently and allows the chicken juices to redistribute, keeping the meat tender.

Discard thyme sprigs, fluff the rice gently with a fork to separate the grains, then stir in chopped parsley, lemon zest and lemon juice. The acid and herbs brighten the dish and cut through the richness.

Taste and adjust seasoning with salt and pepper if needed. Spoon rice onto warm plates and place a thigh on top, finishing with extra chopped parsley and a squeeze of lemon. A final hit of acid and fresh herbs brings forward all the built flavors.

Serve immediately. Leftovers can be cooled quickly and refrigerated for up to 3 days; reheat gently to avoid drying the chicken — a splash of stock and covered warming in a 300°F (150°C) oven for 10–12 minutes works well.