Heat sesame oil in a large skillet over medium-high heat for 1 minute.
Add frozen vegetables and cook for 4 minutes, stirring occasionally, until heated through and slightly tender.
While vegetables cook, heat the rice in the microwave for 2 minutes until steaming hot.
Add shredded chicken, soy sauce, garlic powder, and ginger to the skillet and stir for 2 minutes until chicken is warmed through.
Divide rice among bowls, top with chicken and vegetable mixture, and garnish with sliced green onions before serving.