Preheat the Oven
Preheat your oven to 375°F (190°C).
Prepare the Vegetables
In a large bowl, toss the potatoes and green beans with the olive oil, 1 teaspoon of kosher salt, and ½ teaspoon of black pepper until evenly coated.
Spread the vegetables into a 9×13-inch baking dish.
Add the Chicken
Arrange the chicken thighs on top of the vegetables.
Season the chicken with the remaining salt and black pepper.
Add the Garlic Parmesan Sauce
Spread about 1 tablespoon of garlic Parmesan sauce over each chicken thigh.
Drizzle the remaining sauce over the potatoes and green beans.
Bake
Bake the One Pan Garlic Parmesan Chicken Dinner uncovered for 50–60 minutes.
Halfway through cooking, rotate the baking dish and gently stir any vegetables that are not coated with sauce to ensure even roasting.
The chicken is done when the internal temperature reaches 165°F (74°C) and the skin is golden brown and crispy.
Serve
Allow the chicken to rest for 5 minutes before serving.
Spoon the roasted vegetables alongside each chicken thigh and drizzle with the flavorful pan sauce.