Preheat the oven to 450°F and set your oven rack to the upper half. Set aside a large baking sheet.
Scatter potatoes and tomatoes across the baking sheet. Add chicken breasts in the middle a few inches apart. Rub chicken breasts with 1 tablespoon of oil.
Sprinkle minced garlic, oregano and thyme across the pan. Add salt and pepper to taste.
Drizzle the rest of olive oil evenly across. Toss to mix well. Place several lemon slices on top of chicken.
Butter a piece of parchment paper, and cover the chicken and vegetables with buttered parchment paper (butter side facing down)
Bake for 18 to 20 minutes, adding green beans halfway through (see note).
As soon as clear juice starts to seep out of your chicken breasts, it means that they are cooked through. If chicken looks pale, broil for the last 5 minutes.
Let your chicken rest for 5 to 10 minutes before serving. Cover with aluminum foil while resting.
Garnish with optional fresh minced parsley. Serve and enjoy!