Rosemary Dijon Chicken and Potatoes is one of our absolute favourite recipes and so easy to make. (The link is for a freezer recipe, but I have never frozen it. I always just make it fresh.) The great thing about thighs is that the meat doesn't dry out as quickly as chicken breasts do in the oven.
As someone mentioned above, make sure your chicken thighs are well-trimmed. Only use fresh rosemary in this meal as dried rosemary doesn't impart any flavour and typically just ends up being dry sticks. I have done this in a baking pan and also as a sheet pan meal. If I do it on a sheet pan, I line my baking sheet with foil and spray with cooking spray to make clean-up easier.
(Okay, the Ziploc website doesn't seem to be working, so I will try and put the recipe here. I have made some modifications to the recipe. Originally, it was freezer meal to dump into a crockpot, but I definitely feel like the oven is the way to go with this one.)
¼ cup extra virgin olive oil
3 Tbsp. Dijon mustard
1 Tbsp. fresh rosemary, chopped
½ tsp. salt
¼ tsp. ground black pepper
4 medium-sized Yukon Gold potatoes, cut into large chunks
6 boneless and skinless chicken thighs, well-trimmed, cut into large chunks if desired
In a large bowl, whisk to combine olive oil, mustard, rosemary, salt, and pepper. Add potatoes and chicken and toss until evenly coated. Pour everything into a 9x13 baking pan and bake at 400 degrees, stirring occasionally, until potatoes are golden brown and tender, about 1 hour.