01 -
Generously season chicken breasts with salt, black pepper, and smoked paprika if using.
02 -
Heat olive oil in a large skillet over medium heat. Sear chicken breasts for 4–5 minutes per side until golden brown and cooked through (internal temperature 74°C). Remove and set aside.
03 -
In the same pan, melt butter over medium heat. Add diced onion and cook until translucent, about 3–4 minutes. Stir in minced garlic and sauté for 30 seconds until fragrant.
04 -
Pour in chicken broth, scraping up any browned bits from the pan. Simmer 2–3 minutes to reduce slightly. Stir in heavy cream, Dijon mustard, whole-grain mustard (if using), and thyme, whisking until smooth.
05 -
Reduce heat to low and simmer sauce for 3–4 minutes, stirring occasionally to thicken. Incorporate grated Parmesan, allowing it to melt. Adjust seasoning with additional salt and pepper if needed.
06 -
Add fresh spinach to the sauce. Stir gently until wilted, approximately 2–3 minutes.
07 -
Return seared chicken breasts to the pan, spooning sauce with spinach over the top. Simmer on low for 5 minutes to blend flavors.
08 -
Sprinkle with chopped fresh parsley and serve immediately. Pairs well with rice, mashed potatoes, roasted vegetables, or crusty bread.