Prepare the chicken: Pat the chicken breasts dry and cut into 1-inch (2.5 cm) pieces. Season lightly with 1/2 teaspoon kosher salt and 1/4 teaspoon black pepper. Drying the meat helps it brown rather than steam; browning builds Maillard flavors that make the final dish savory and complex.

Heat the pan: Place a large, heavy-bottomed skillet or Dutch oven over medium-high heat and add the olive oil. When the oil shimmers (about 30–45 seconds), add half the chicken in a single layer and leave undisturbed for 2–3 minutes to develop a golden crust. Don’t overcrowd the pan — crowding drops temperature and causes steaming instead of browning.

Brown the chicken: Flip the pieces and brown the other side for 1–2 minutes until lightly golden but not cooked through. Transfer browned pieces to a plate and repeat with remaining chicken. You’re not fully cooking the chicken now — you’re only building a flavored crust. The chicken will finish cooking in the rice liquid.

Sweat the aromatics: Reduce heat to medium. Add the butter to the same pan; once melted, add the diced onion and a pinch of salt. Cook, stirring occasionally, for 4–5 minutes until the onion is soft and translucent. Sweating the onion extracts sweetness and forms a flavor base for the rice.

Toast the rice: Add the rice to the pan and stir to coat grains in butter and residual fond (browned bits). Toast the rice for 1–2 minutes until it smells toasty. Toasting helps the grains stay separate and adds a subtle nuttiness; it also improves texture by coating each grain in fat so it absorbs liquid more evenly.

Add garlic and seasonings: Stir in the minced garlic, paprika, and the bay leaf for 30 seconds to bloom the spices and release aromatics. Blooming spices briefly in fat intensifies their flavor and aromas.

Deglaze and add liquids: Pour in the chicken stock and milk (pour stock first to scrape up any browned bits). Stir and bring to a gentle simmer. The combination of milk and stock creates a creamy cooking liquid that gives the rice richness without relying only on heavy cream.

Return chicken and simmer: Nestle the browned chicken pieces back into the liquid, partially cover the pan, and reduce heat to low–medium so the pot maintains a gentle simmer (small bubbles, not a rolling boil). Cook for 18–22 minutes, stirring once or twice halfway through to ensure even cooking. Cooking covered allows the rice to absorb liquid while a gentle simmer prevents milk from scorching or curdling.

Check for doneness and finish: After 18 minutes check the rice — grains should be tender with a slight bite (al dente) and the chicken should reach 165°F (74°C) internal temperature. If the rice is still too firm and liquid is nearly gone, add up to 1/4 cup hot stock or water and cook a few more minutes. Remove from heat, discard the bay leaf.

Enrich and rest: Stir in the grated Parmesan (if using) and the remaining 1/4 tsp kosher salt (or to taste) and 1/4 tsp black pepper. The cheese and butter will melt into the rice, rounding and deepening flavors while adding shine. Let the pan rest, covered, for 5 minutes — resting lets the steam finish the rice and sets the texture.

Serve: Fluff gently with a fork to separate grains, spoon into shallow bowls, and garnish with chopped parsley and a squeeze of lemon if using. The contrast of bright acid from lemon lifts the creamy richness and makes the dish feel balanced and restaurant-ready.