Ain't nothing wrong with bringing more Dijon into your life. Here, you get to sauce a chicken breast with a luxurious mix of robust Dijon, cream, and rich butter. But mustard isn't the only star of this dish: You'll never eat zucchini the same way after savoring it in this gratin, made with nutty Parmesan and jammy sun-dried tomatoes, and topped with crispy fried onions.
Trim zucchini ends and slice into ½" rounds on an angle.
Cut sun-dried tomatoes into ¼" dice.
Coarsely chop crispy fried onions.
Pat chicken breasts dry, and season both sides with ¼ tsp. salt and ¼ tsp. pepper.
Cook the Zucchini
Place a large non-stick pan over high heat and add 2 tsp. olive oil.
Add zucchini to hot pan and stir often until browned but still crunchy, 2-3 minutes.
Make the Gratin
Remove pan from burner and stir in sun-dried tomatoes, ¼ tsp. salt, and a pinch of pepper.
Place casserole dishes on prepared baking sheet to catch any drips. Transfer zucchini mixture to prepared casserole dishes. Wipe pan clean and reserve.
In each dish, pour 1 Tbsp. cream (reserve remaining for sauce) over zucchini mixture and top with Parmesan. Bake in hot oven until golden brown, 8-12 minutes.
Remove from oven. Rest 5 minutes, then sprinkle crispy onions on top.
While gratin bakes, cook chicken.
Cook the Chicken
Return pan used to cook zucchini to medium-high heat and add 2 tsp. olive oil.
Add chicken breasts to hot pan and cook undisturbed until browned, 3-5 minutes.
Flip chicken, reduce heat to medium, and cook until chicken is browned and reaches a minimum internal temperature of 165 degrees, 4-6 minutes.
Remove chicken to a plate and rest 3 minutes.
Reserve pan; no need to wipe clean.
Make Sauce and Finish Dish
Return pan used to cook chicken to medium-high heat.
Add 2 Tbsp. water, reserved cream, and accumulated juices from resting chicken. Bring to a boil.
Remove from burner. Stir in Dijon and a pinch of salt. Sauce will thicken as it cools.
Plate dish as pictured on front of card, slicing chicken if desired and garnishing chicken with sauce. Serve gratin on a plate or in casserole dish. Bon appétit!