Prep the chicken. Pat chicken dry with paper towels. If using breasts, slice them in half horizontally to make cutlets for quick, even cooking. Season both sides with 1–1½ tablespoons Cajun seasoning, plus a pinch of salt and pepper.

Heat the pan. Set a large skillet over medium-high heat. Add 1 tablespoon oil and 1 tablespoon butter. When the butter foams, it’s ready.

Sear the chicken. Add chicken in a single layer. Don’t crowd the pan. Cook 3–5 minutes per side, until golden with a light crust and just cooked through. Transfer to a plate and tent with foil.

Sauté aromatics. Lower heat to medium. Add a little more oil if the pan is dry. Stir in 1 finely chopped shallot (or ½ onion) and cook 2 minutes. Add 4–5 minced garlic cloves and cook 30 seconds, just until fragrant.

Deglaze and build the base. Pour in ½ cup chicken broth and scrape up the browned bits. Let it reduce by about half, 2–3 minutes.

Add cream and balance. Stir in ¾–1 cup heavy cream. Simmer gently (don’t boil) until slightly thickened, 3–5 minutes. Add ¼ cup grated Parmesan and whisk until smooth. Taste and adjust with salt, pepper, and more Cajun seasoning if needed.

Brighten it up. Add 1–2 teaspoons lemon juice and a pinch of zest. This keeps the sauce lively and prevents it from feeling heavy.

Optional veggies. If using spinach, mushrooms, tomatoes, or peppers, sauté them briefly after the aromatics or fold tender greens into the sauce until just wilted.

Return the chicken. Nestle the chicken into the sauce with any juices from the plate. Simmer 2 minutes to warm through and let flavors mingle.

Finish and serve. Sprinkle with chopped parsley. Serve over rice, pasta, or mashed potatoes, spooning plenty of sauce over the top.