Creating Decadent French Chicken with Creamy Mustard-White Wine Sauce is a straightforward process. Follow these steps to bring this delicious dish to life:

1. Prepare the Chicken: Season the chicken breasts with salt and pepper on both sides.
2. Heat the Pan: In a large skillet, heat the olive oil over medium-high heat. Add the butter and let it melt.
3. Cook the Chicken: Place the seasoned chicken breasts in the skillet. Cook for about 6-7 minutes on each side, or until golden brown and cooked through. Remove the chicken from the skillet and set aside.
4. Sauté the Aromatics: In the same skillet, add the chopped onion and cook for 2-3 minutes until softened. Add the minced garlic and sauté for an additional minute, being careful not to burn it.
5. Deglaze the Pan: Pour in the white wine, scraping up any browned bits from the bottom of the skillet. Let it simmer for about 5 minutes to reduce slightly.
6. Make the Sauce: Lower the heat and stir in the heavy cream, Dijon mustard, and thyme. Mix well until the sauce is combined.
7. Return the Chicken: Place the cooked chicken breasts back into the skillet, spooning the sauce over the top. Let it simmer for an additional 5 minutes to heat through and allow the flavors to meld.
8. Garnish and Serve: Remove from heat, sprinkle with fresh parsley, and serve hot.

With these steps, you will create a dish that not only looks beautiful but also tastes incredible, leaving your guests wanting more.