Preheat your oven to 375°F.
Pat the chicken breasts completely dry.
Season both sides with salt and pepper.
Place them in your baking dish.
Mix both mustards in a bowl.
Add the white wine slowly.
Whisk in olive oil and garlic.
Stir until everything combines smoothly.
Pour the mustard mixture over chicken.
Make sure each piece is coated.
Bake for 30-35 minutes uncovered.
The chicken should reach 165°F internally.