Make the marinade by adding the orange, lemon, and lime juice into a food processor. After, add the garlic and spices and turn the food processor on to combine all the ingredients and mince the garlic. Set aside.
Then, cut the chicken breast in half, and lay on a cutting board one by one. Place saran wrap over the breast, one by one, and pound it with a kitchen hammer or a pan, to make it about a quarter inch thick.
Place it in a bowl and drench it in your marinade. The longer you let it soak the better. Top it off with sliced onions.
To grill the chicken, coat a pan with oil and heat over medium-high heat. Once the oil is hot, place the chicken breast in. Cook each side for about three to four minutes, until the chicken is slightly browned on each side.
After you finish cooking the chicken, place the onions in the same pan and sauté them for about 5 minutes.
Serve with rice or any other side and enjoy!