Step 1

Preheat the oven to 450°F. Line 2 baking sheets with foil.

Step 2

In a large bowl, combine chicken, mustard, mayo and ½ teaspoon of salt and mix well to coat the chicken evenly. (TIP: You can prepare this step up to 1 day in advance!)

Step 3

Arrange the chicken thighs on one baking sheet.

Step 4

On the 2nd baking sheet, toss the potatoes with olive oil, remaining teaspoon of salt, pepper, rosemary and garlic powder.

Step 5

Place the chicken on middle rack, and potatoes on lower rack.

Step 6

Roast for 30-40 minutes, or until chicken is well browned, and inserted thermometer reads 165°F, and potatoes are golden brown. Stir the potatoes couple of times, during roasting.