Everything turned out great, definitely roasted just a bit longer to get more color and crisp on the skin. I hate to change anything then comment on a recipe but I took the liberty of cutting the butter with some olive oil to reduce the amount of butter and pretend it was slightly healthier.
The potatoes soaked up the lemon and onion and were fantastic and the chicken was juicy and delicious as well. Don't skimp on the herbs and use fresh or high quality dried to avoid bland flavor. Just remember it's not supposed to taste like a lemon wedge, lemon is always meant to be subtle in flavour and thighs are a must. Breasts will be too dry.