Preheat your oven to 450 degrees Fahrenheit.

In a bowl, toss the potatoes, peppers, and onions with three tablespoons oil, one packet Haddar Italian seasoning and one teaspoon paprika. Mix until well coated, then pour onto a parchment-lined baking sheet. Bake uncovered for 30 minutes.

When the potatoes are nearly done, combine the chicken with Dijon and the remaining one teaspoon paprika, one packet of Italian seasoning, and one tablespoon oil. Toss to coat. Add the panko crumbs and mix until evenly distributed.

Remove the sheet pan from the oven and nestle the chicken pieces into the potatoes, peppers and onions. Spray with oil and return to the oven to bake for 20 more minutes.