Begin by marinating your chicken.
Add the chicken to a bowl. Top with the mustard, rosemary, basil, lemon juice, 1 tablespoon of olive oil, 1 teaspoon of salt and ½ teaspoon of black pepper.. Mix well with your hands. Place a lid on top and allow to marinade for 2-6 hours.
Preheat the oven to 375 degrees F.
Slice your potatoes using a knife or mandolin.
Line a sheet pan with the remaining 3 tablespoons of olive oil. Layer the potatoes in a single layer over the sheet pan. Sprinkle the remaining salt and pepper over the top of the potatoes.
Bake for 20 minutes until the potatoes begin to cook and crisp up.
Remove the potatoes from the oven and place the chicken on top. The potatoes should act as a bed for the chicken, catching all the juices as it cooks.
Return to the oven for another 20-30 minutes, depending on the size of your chicken breasts.
Once the chicken is cooked and the potatoes are crispy, remove from the oven.
Garnish with fresh parsley and lemon wedges, as desired.