This dish is great for a lazy fall day. Once the chicken marinates, in under an hour you'll have a Sunday dinner that will do any perfect fall day proud.
In a food processor or blender, puree olive oil, vinegar, marmalade, garlic, rosemary, the zest and juice from one lemon, salt, and pepper until well mixed.
Pour the marinade over the chicken thighs. Refrigerate and let marinate for 4-6 hours or overnight.
When ready to prepare, preheat oven to 400°F.
Add potatoes and sweet potatoes to a saucepan and cover in water. Bring to a boil and cook until just barely tender, about 5 minutes. Drain.
Meanwhile, heat the butter in a large oven-proof roasting pan or skillet over medium-high heat. Place the chicken, skin-side-down, in the pan and pour the marinade over the top.
Sear the chicken for 4-5 minutes, then flip the chicken and sear 4-5 minutes on the other side.
Remove pan from heat, remove chicken from pan, and set aside.
In the pan, toss the potatoes and mushrooms in the sauce until well coated. Add the chicken back into the pan, nestling the chicken thighs into the vegetables.
Squeeze the juice from the remaining lemon over the entire pan and then place the lemon halves in the pan.
Roast in the oven for 25-30 minutes, or until chicken is cooked through to 165°F and golden brown.
Notes
For a thicker, sweeter sauce, use 2-3 tablespoons orange marmalade in the marinade.
Feel free to use regular yellow potatoes instead of baby potatoes, just make sure to cut them in bite-sized chunks.