Season the chicken: Pat the chicken dry. Mix salt, pepper, garlic powder, and smoked paprika.
Rub evenly over both sides.
Sear to lock in juices: Heat the oil and 1 tablespoon butter in a large skillet over medium-high heat. Add chicken in a single layer and sear 4–6 minutes per side until golden and cooked through (165°F internal). Transfer to a plate and tent loosely with foil.
Soften the garlic: Reduce heat to medium.
Add remaining 2 tablespoons butter. Stir in the minced garlic and cook 30–60 seconds until fragrant. Don’t let it brown.
Deglaze the pan: Pour in the chicken broth.
Scrape up browned bits with a wooden spoon. Simmer 2–3 minutes to reduce slightly.
Make it creamy: Stir in the heavy cream and Parmesan. Add Dijon if using.
Simmer gently 2–4 minutes, stirring, until the sauce thickens enough to coat a spoon.
Balance the flavors: Taste and add a pinch of salt and pepper. If the sauce feels too rich, brighten with lemon zest and juice.
Return the chicken: Nestle the chicken and any juices back into the pan. Spoon sauce over the top and simmer 1–2 minutes to warm through.
Finish and serve: Sprinkle with chopped herbs.
Serve hot with low-carb sides like sautéed zucchini, roasted broccoli, or cauliflower mash.