Step 1: Preheat Oven: Preheat oven to 400F (200C). Ensure the oven rack is positioned in the middle.
Step 2: Prepare Vegetables: In a large bowl, combine the quartered red potatoes, red onion wedges, sliced carrots, and chopped bell peppers. Add the minced garlic, olive oil, rosemary, paprika, salt, and pepper. Toss well to ensure the vegetables are evenly coated with the oil and seasonings.
Step 3: Arrange Vegetables on Baking Sheet: Spread the seasoned vegetables in a single layer on a large baking sheet.
Step 4: Prepare Chicken Thighs: Pat the chicken thighs dry with paper towels. Season the chicken thighs with salt, pepper, and a pinch of paprika.
Step 5: Place Chicken on Baking Sheet: Arrange the seasoned chicken thighs on top of the vegetables on the baking sheet, spacing them evenly.
Step 6: Bake: Bake in the preheated oven for 35-40 minutes, or until the chicken thighs are cooked through and the internal temperature reaches 175-180F (80-82C). The chicken skin should be crispy and golden brown.
Step 7: Rest: Remove the baking sheet from the oven and let the chicken and vegetables rest for 5-10 minutes before serving.
Step 8: Serve: Serve the one-pan baked chicken thighs and vegetables hot, garnished with fresh rosemary and lemon wedges, if desired.
Optional Tips: For extra crispy chicken skin, broil for the last 2-3 minutes, watching carefully to avoid burning. Other vegetables, such as broccoli florets, Brussels sprouts, or sweet potatoes, can be substituted. For a spicier flavor, add a pinch of red pepper flakes to the vegetables.