Preheat the oven to 425 degrees F. Spray a rimmed baking sheet or large casserole dish with cooking spray. Alternatively, you can line with parchment paper.
In the prepared baking dish, combine the potatoes, 1 tablespoon olive oil, 1 clove minced garlic, 1/2 teaspoon of the oregano, 1/2 teaspoon of the salt, and 1/4 teaspoon of the black pepper. Toss well to coat.
While the potatoes are roasting, pat the chicken dry with paper towels and season all over with the remaining 1/2 teaspoon of salt, and 1/2 teaspoon black pepper.