Creating Herb Roasted Chicken in Creamy White Sauce with Mushroom and Potatoes is straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 400°F (200°C).
2. Prepare Chicken: Season the chicken thighs with salt, pepper, thyme, and rosemary. Rub the herbs into the skin for better flavor.
3. Sauté Vegetables: In a large oven-safe skillet, heat olive oil over medium heat. Add the diced onion and cook until translucent, about 3-4 minutes. Add minced garlic and cook for another minute.
4. Add Mushrooms and Potatoes: Stir in the sliced mushrooms and halved potatoes. Cook for about 5 minutes, allowing the mushrooms to soften.
5. Add Cream and Broth: Pour in the heavy cream and chicken broth, stirring to combine. Bring the mixture to a gentle simmer.
6. Nestle Chicken: Place the seasoned chicken thighs skin side up in the skillet, ensuring they are nestled among the vegetables and sauce.
7. Roast: Transfer the skillet to the preheated oven and roast for 40-45 minutes, or until the chicken is cooked through and the skin is golden and crispy. The internal temperature should reach 165°F (75°C).

These steps will guide you in creating this incredible dish effortlessly.