Add olive oil to a non-stick skillet over high heat. Add the frozen vegetables and sauté for 5-7 minutes.
While the vegetables are sautéing, whisk the broth, soy sauce, corn starch, garlic and black pepper in a bowl until combined.
Add the chicken and sauce to the pan and sauté another 5-7 minutes, until chicken is heated through and sauce is thickened.
Serve or let cool then store in an airtight container in the refrigerator for up to 1 week.