Season the chicken breast evenly with garlic powder, onion powder, sea salt, and black pepper.
Heat avocado oil in a large stainless steel or cast iron skillet over medium-high heat.
Place the chicken in the pan and sear for 6 to 7 minutes per side until the exterior is golden-brown and the internal temperature reaches 165°F.
Remove the chicken from the skillet and let it rest on a cutting board for 5 minutes.
In the same skillet, add the minced garlic, ginger, broccoli florets, and sliced bell peppers, sautéing for 5 minutes until tender-crisp.
Pour in the chicken broth and tamari to deglaze the pan, stirring to incorporate the flavorful browned bits.
Fold in the cooked quinoa and sesame oil, stirring for 2 minutes until the grains are warmed through and coated in the savory sauce.
Slice the rested chicken into strips and serve immediately over the quinoa and vegetable medley.