Season chicken with salt, pepper, and paprika.
Heat butter and olive oil in a skillet over medium heat.
Sear chicken 5–6 minutes per side until golden and cooked through. Remove and set aside.
In the same pan, sauté mushrooms until browned and tender.
Add garlic and thyme; cook 30 seconds.
Pour in chicken broth, scraping up browned bits. Stir in cream, Dijon, and parmesan.
Simmer 2–3 minutes until thickened slightly.
Return chicken to the pan and coat in sauce. Simmer 2–3 more minutes.
Garnish with parsley and serve hot.