Preheat your oven to 400°F (200°C).
In a mixing bowl, whisk together olive oil, lemon juice, dried Italian herbs, minced garlic, salt, and black pepper.
Place the chicken thighs on one side of the sheet pan. Brush the chicken with half of the lemon herb mixture, ensuring they're well-coated.
On the other side of the sheet pan, arrange the halved baby potatoes, broccoli florets, and sliced red bell pepper. Drizzle the remaining lemon herb mixture over the vegetables and toss to coat.
Arrange the vegetables in a single layer around the chicken. Place lemon slices on top of the chicken and around the pan for added flavor.
Roast in the preheated oven for 30 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the vegetables are tender and slightly charred.
Remove from the oven and let it rest for a few minutes before serving.