Pre-heat oven to 375°F.
Lightly spray a baking sheet with cooking spray and set aside.
Place potatoes into a large bowl. Toss with lemon juice, oregano, salt, pepper and olive oil until evenly coated.
Arrange potatoes on the baking sheet and place in the oven. Roast for 40-50 minutes flipping the potatoes after 20 minutes.
Remove potatoes from oven and transfer to a serving dish. Top with feta and enjoy.