Preheat the oven to 400 degrees F. Line a baking sheet with parchment paper. Set aside.
Cut the stalks off the tops of the beets. Using a vegetable brush, scrub the beets.
Trim the tops about ½” down into the root and trim the bottom root off.
Using a vegetable peeler or sharp paring knife, peel the skins off each beet.
Slice the beets into ¼” slices. Thicker slices will take longer in the oven.
Place the beet slices into a zip-top bag or in a bowl. Add the oil, salt, and pepper and shake the bag, or toss the beets in the bowl, to evenly coat the beets.
Lay the beets in a single layer on the lined baking sheet. Bake in the preheated oven for 40 minutes, or until a fork pierced into a beet is not resisted.. Thicker slices will take longer, and thinner slices will take less time.
Remove the beets from the oven and place them onto a serving platter. Sprinkle with the parsley.
Serve warm. Or use in Roasted Beet Salad with Asian Flair or Roasted Beets with Caramelized Onions, Candied Walnuts, Balsamic, and Orange Zest.