Preheat oven to 400° Fahrenheit. Place all potato ingredients on a large baking sheet and toss to combine. Bake for 25-20 minutes or until super crispy, flipping potatoes halfway through.
Make the chicken scarpariello by patting each chicken thigh dry with a paper towel, then season generously with salt and black pepper.
Heat olive oil in a large skillet over medium-high heat, cook sausages in skillet for 2-3 minutes per side of until golden brown (but not yet fully cooked). Remove sausage form skillet and set aside.
Place chicken thighs in hot skillet with the skin-side facing down. Sear chicken thighs for 5-8 minutes, or until golden brown, but also not yet fully cooked through. Remove chicken thighs from skillet and set aside.
Add onions, bell pepper, and garlic to the skillet - cook until soft and very fragrant, about 8 minutes.
Add rosemary, pickled peppers, white wine, and chicken stock to the skillet and bring to a boil. Whisk and continue to cook until liquid has slightly reduced.
Place sausages and chicken back into the skillet with the sauce, then transfer to the oven and cook for about 10-15 minutes or until chicken is cooked through. Remove from oven along with the potatoes, pour lemon juice over chicken, then serve over roasted potatoes with fresh chopped parsley.