Preheat the oven to 400°F (204°C). Pat the chicken dry and season both sides with olive oil, garlic powder, oregano, salt, and pepper. Arrange in a baking dish.
Whisk together the melted butter, garlic, lemon juice, and chicken broth or white wine.
Scatter the sliced shallots around the chicken, pour the sauce over everything, and tuck the lemon slices throughout the dish.
Bake uncovered for 12 to 15 minutes, until the chicken reaches 165°F (74°C).
Broil for 1 to 2 minutes if desired. Garnish with parsley and spoon the pan sauce over each serving.