Preheat the grill or oven to 375°F (190°C).
Season the chicken breasts with olive oil, salt, and pepper.
Grill or bake the chicken for 20-25 minutes until fully cooked.
Rinse the quinoa under cold water.
Cook quinoa according to package instructions (usually 15 minutes).
Chop the mixed vegetables into bite-sized pieces.
Sauté the vegetables in a pan over medium heat for 5-7 minutes.
Slice the chicken into strips once cooked.
Divide the quinoa, vegetables, and chicken into meal prep containers.
Garnish with fresh herbs if desired.