In a large mixing bowl, combine the extra virgin olive oil, low sodium soy sauce, minced garlic, chopped oregano, ground cumin, cayenne pepper, orange zest, orange juice, lime zest, lime juice, kosher salt, and black pepper. Whisk together until well-combined. Add the cubed chicken to the marinade, making sure each piece is thoroughly coated. Cover the bowl and let it marinate in the refrigerator for at least 30 minutes, or up to 2 hours for maximum flavor.
While the chicken marinates, prepare the sweet onion and bell peppers by slicing them into thin strips. This allows them to cook evenly and absorb the delicious flavors.
Preheat your oven to 425°F (220°C). This high temperature will help get a beautiful char on the chicken and vegetables, enhancing their flavors.
Once the chicken has marinated, take it out of the refrigerator. On a large sheet pan, spread out the marinated chicken, sliced onions, and bell peppers in a single layer. Ensure everything is evenly distributed to cook evenly.
Place the sheet pan in the preheated oven and roast for about 20-25 minutes, or until the chicken is cooked through and the vegetables are tender and slightly caramelized. Toss the ingredients halfway through cooking for even roasting.
While the chicken and vegetables are roasting, prepare your rice according to package instructions. Once the rice is done, stir in the drained black beans to warm them up.
Once the chicken and vegetables are ready, remove the sheet pan from the oven. To assemble, start with a generous scoop of rice and black beans at the bottom of each bowl. Top it with the roasted chicken and vegetables.
Finish off your bowls with sliced avocado, diced mango, chopped Fresno pepper, and fresh cilantro. Squeeze extra lime juice over the top for a burst of freshness.