Preheat the oven to 425℉. Line a large baking sheet (12"x18") with parchment paper and set it aside.
In a large bowl, whisk together the olive oil, lemon juice, orange juice, minced garlic, chopped rosemary, thyme leaves, dried oregano, salt, and pepper.
1/4 cup olive oil, 2 lemons, 1 large orange, 4 cloves garlic, 2 tablespoons fresh rosemary, 1 tablespoon fresh thyme leaves, 1 teaspoon dried oregano, 1 teaspoon kosher salt, ½ teaspoon black pepper
Add in the chicken breasts, halved potatoes, and red onion wedges. Toss to coat everything evenly.
4 boneless, skinless chicken breasts, 1½ pounds baby red potatoes OR baby yellow potatoes, 1 red onion
Arrange the orange slices on the prepared baking sheet and then add the chicken and potato mixture in a single layer over the orange slices. Arrange the lemon slices over top the chicken and potatoes.
Bake in the oven for 35-40 minutes or until the chicken is cooked through (internal temperature should be at least 165℉) and the potatoes are fork tender and golden brown.
Remove the pan from the oven and sprinkle the fresh parsley over top. Let the chicken rest for 5 minutes before serving.
1 tablespoon finely chopped fresh parsley