Prepare your ingredients. Pat the chicken breasts dry with a paper towel to ensure a nice golden sear. Trim and halve your Brussels sprouts, removing any tough outer leaves. Mince the garlic and set aside. Having everything ready at the start makes cooking smooth and stress-free.
Season the chicken. In a small bowl, mix half of the salt, half of the pepper, and the smoked paprika if using. Rub this seasoning evenly over both sides of the chicken breasts. Proper seasoning at this stage ensures every bite is flavorful and juicy.
Sear the chicken. Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. Once hot, add the chicken breasts and cook for about 4-5 minutes on each side, until golden brown. Remove the chicken from the skillet and set aside. The goal is a beautiful crust while keeping the inside tender.
Cook the Brussels sprouts. Reduce the heat to medium and add the remaining olive oil and butter. Toss in the Brussels sprouts cut side down and season with the remaining salt and pepper. Cook for about 5-6 minutes, stirring occasionally, until they are crisp-tender and slightly caramelized.
Add garlic and create the sauce. Stir in the minced garlic and cook for another 30 seconds until fragrant. Pour in the chicken broth and lemon juice, scraping up any brown bits from the bottom of the skillet. This creates a quick, flavorful sauce that brings the dish together.
Finish cooking the chicken. Return the chicken to the skillet, nestling it among the Brussels sprouts. Reduce the heat to low and cover the skillet. Cook for another 5 minutes, or until the chicken reaches an internal temperature of 165 degrees Fahrenheit. Sprinkle with chopped parsley before serving for a fresh, vibrant touch.