Preheat oven to 425 degrees Fahrenheit.
While oven preheats slice bell peppers and onions and place in a mixing bowl. Drizzle with one tablespoon grapeseed oil and sprinkle on 2 tablespoons fajita seasoning. Mix well and spread on to a large sheet pan.
Place the chicken breast in the same bowl that the peppers and onions were in. Drizzle with remaining one tablespoon of grape seed oil and sprinkle the remaining fajita seasoning on top. Mix well and place on the sheet pan.
Zest half the orange and lime on top of the veggies and chicken. Then slice the fruit into wedges or slices. Squeeze juice of orange and lime over the veggies and chicken and place the fruit on the sheet pan to cook with the fajitas.
Place the sheet pan in the oven and bake for 30 minutes or until the internal temperature of the chicken reaches 165 degrees Fahrenheit.
Remove the sheet pan from the oven, slice chicken and place the sheet pan on the table to build fajitas. Use your favorite tortilla and toppings of choice like guacamole, sour cream, and shredded cheese on top.