01 - Toss chicken cubes with paprika, salt, and black pepper until evenly coated.
02 - Heat 1 tablespoon butter in a large deep skillet over medium-high heat. Add seasoned chicken and cook until golden brown and cooked through, about 5–6 minutes. Transfer to a plate and set aside.
03 - Reduce heat to medium. Melt remaining butter in the same skillet. Add garlic and onion, cook until fragrant and translucent, 2–3 minutes.
04 - Stir in orzo pasta and toast for 1 minute, stirring constantly to coat with butter.
05 - Pour in chicken broth and whole milk. Stir well, scraping up any browned bits from the bottom of the skillet.
06 - Bring to a gentle simmer. Cook uncovered for 8–10 minutes, stirring occasionally, until orzo is tender and most liquid has been absorbed.
07 - Stir in heavy cream, cooked chicken, spinach, and Pepper Jack cheese. Continue stirring until spinach wilts and cheese melts completely, 2–3 minutes. Adjust seasoning if needed.
08 - Sprinkle with fresh parsley and serve with lemon wedges on the side.