Follow these steps to create your own French Mustard Chicken:

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 and butter over medium heat until melted and hot.
3. Cook the Chicken: Add the chicken breasts to the skillet. Cook for about 6-7 minutes on each side until golden brown and cooked through. Remove the chicken from the pan and set aside.
4. Sauté Garlic: In the same skillet, add the minced garlic. Sauté for about 1 minute until fragrant.
5. Make the Sauce: Stir in the Dijon mustard, whole grain mustard, and dried thyme. Cook for another minute.
6. Add Cream: Pour in the heavy cream, stirring to combine. Bring the mixture to a gentle simmer.
7. Return Chicken: Place the cooked chicken back into the skillet, spooning the sauce over the top. Let it simmer for an additional 5 minutes to absorb the flavors.
8. Garnish: Remove from heat and garnish with freshly chopped parsley, if desired.

These simple steps will guide you in creating a delicious French Mustard Chicken that your family and friends will love.