Crafting Decadent French Chicken with Creamy Mustard-White Wine Sauce can be straightforward if you follow these simple steps:

1. Prepare the Chicken: Season the chicken breasts with salt and pepper on both sides.
2. Heat the Oil: In a large skillet, heat the olive oil over medium-high heat.
3. Sear the Chicken: Add the chicken breasts to the skillet and cook for about 5-7 minutes on each side until golden brown and cooked through. Remove the chicken from the skillet and set aside.
4. Sauté Onions and Garlic: In the same skillet, add the chopped onion and cook until translucent, about 3-4 minutes. Add the minced garlic and cook for an additional minute.
5. Deglaze with Wine: Pour in the white wine, scraping the bottom of the skillet to release any flavorful bits. Allow it to simmer and reduce for about 5 minutes.
6. Add Cream and Mustard: Lower the heat and stir in the heavy cream and Dijon mustard, mixing until smooth.
7. Incorporate Thyme: Add the thyme to the sauce and season with salt and pepper to taste. Let the sauce simmer gently for about 3-4 minutes until thickened.
8. Return Chicken to Skillet: Place the chicken back in the skillet, spooning the sauce over the top. Allow it to warm through for an additional 2-3 minutes.
9. Garnish and Serve: Remove from heat, garnish with fresh parsley, and serve immediately.

These steps will guide you in creating this incredible dish effortlessly.