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Preheat the Oven: Preheat your oven to 400°F (200°C).
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Marinate the Chicken: In a small bowl, mix together the olive oil, oregano, thyme, garlic powder, onion powder, lemon juice, salt, and pepper. Place the chicken breasts in a large bowl or a resealable bag and pour the marinade over them. Ensure the chicken is well coated and marinate for at least 15 minutes (or up to 2 hours in the fridge for more flavor).
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Prepare the Vegetables: While the chicken is marinating, chop your mixed vegetables into bite-sized pieces. In a large bowl, toss the vegetables with olive oil, rosemary, salt, and pepper until evenly coated.
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Arrange on Baking Sheet: On a large baking sheet, arrange the marinated chicken breasts in the center. Surround the chicken with the prepared vegetables.
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Roast in the Oven: Roast everything in the preheated oven for about 25-30 minutes or until the chicken is cooked through (internal temperature should reach 165°F or 74°C) and the vegetables are tender and slightly caramelized.
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Serve: Remove from the oven and let the chicken rest for a few minutes before slicing. Serve the herb chicken alongside the roasted vegetables for a healthy and hearty meal.