In a large mixing bowl, combine the halved baby potatoes with olive oil, dried thyme, dried rosemary, salt, and black pepper. Toss until evenly coated and spread on a baking sheet in a single layer.
Roast the baby potatoes for approximately 25-30 minutes, tossing halfway through.
While the potatoes are roasting, heat a large skillet over medium heat. Season the chicken breasts with salt and black pepper, then cook for about 6-7 minutes on each side until browned and cooked through.
In the same skillet, add minced garlic and sauté for 30 seconds. Stir in Dijon mustard and heavy cream, simmering for 3-4 minutes until slightly thickened. Return the chicken to the skillet, coating it with the sauce.
On a serving plate, arrange the roasted potatoes and place the creamy Dijon chicken on top. Drizzle any remaining sauce over the chicken.
Garnish with chopped fresh parsley.
Notes
Make sure to toss the potatoes halfway through roasting for even cooking.