Pat chicken thighs completely dry and season all over with the spice blend. Let rest for 10-15 minutes.
Rinse rice in a fine mesh strainer under cold water until water runs clear. Shake well to drain.
Heat oil in a Dutch oven over medium-high heat. Sear chicken skin-side down for 6-8 minutes until golden, then flip and cook 3-4 minutes more. Transfer to a plate and reserve 2 tbsp of fat in the pot.
Reduce heat to medium and sauté onion in the reserved fat for 4-5 minutes, scraping up browned bits. Add garlic and cook 1 minute until fragrant.
Add rinsed rice and stir continuously for 1-2 minutes to toast until slightly opaque and fragrant.
Pour in chicken broth and lemon juice. Stir, scrape up any bits from the bottom, and bring to a vigorous boil. Taste and adjust seasoning.
Nestle seared chicken thighs skin-side up into the boiling liquid. Reduce heat to low, cover tightly, and cook for 20-22 minutes without lifting the lid.
Remove lid, increase heat to medium-high, and cook uncovered for 3-5 minutes to crisp the bottom rice layer. Check chicken reaches 165°F (74°C) internally.
Rest for 5 minutes off heat. Garnish with fresh parsley and serve with lemon wedges, scraping up the crispy rice from the bottom.