Heat 1 tablespoon of vegetable oil in a large skillet or wok over medium-high heat. Add the mixed vegetables and sauté for about 3-4 minutes until they are tender. Remove the vegetables from the skillet and set aside.
In the same skillet, add the remaining tablespoon of oil. Pour in the beaten eggs and scramble until fully cooked. Remove the eggs from the skillet and set aside with the vegetables.
Add the cooked chicken to the skillet and stir-fry for 2-3 minutes until heated through.
Add the cooked rice to the skillet, breaking up any clumps. Pour in the BBQ sauce and soy sauce, mixing well to combine all ingredients.
Stir in the sautéed vegetables, scrambled eggs, garlic powder, and season with salt and pepper to taste. Cook for an additional 2-3 minutes until everything is heated through.
Remove from heat and garnish with sliced green onions before serving.