1. Preboil the potatoes until they are easy to pierce with a fork. Let cool and cut into bite-sized pieces.
2. Preheat an oven to 400 degrees F.
3. In a parchment-lined baking dish add the pre-boiled potatoes and the green beans. Drizzle with a bit of oil and bake for 10 minutes to give them a head start.
4. Cut the chicken breasts in half (length-wise) to create thinner breasts. In a frying pan over medium heat, add a bit of olive oil and brown both sides. Set aside temporarily.
5. In the same fry pan add the onions, garlic, and a bit of oil. Fry for a few minutes until soft. Add the remaining dreamy dill sauce ingredients and stir together for a few minutes.
6. Transfer the chicken onto the sheet pan and drizzle over the sauce.
7. Bake until the chicken reaches an internal temp of 160 degrees F.
8. Add the fresh mozzarella to the sheet pan and set the oven to broil (high) for the last 1-2 minutes.
9. Sprinkle over some fresh dill and serve!