Preheat your oven to 350°F and line a baking sheet with parchment paper. Place the fully cooked Costco chicken pieces on the parchment paper, then generously cover them with Costco Orange sauce. Bake for 18-20 minutes until the sauce is bubbly and the chicken is hot all the way through.
While your chicken bakes, prepare your vegetables by heating some oil in a separate pan over medium heat. Add the veggies of your choice, and cook for 8-10 minutes until they are tender and lightly browned.
Once everything is cooked, assemble the dish by adding the chicken to the veggie mixture. Serve hot with rice or any side you desire.