Thinly slice the chicken breast into small, bite-sized strips for even cooking.
Mince the garlic clove and finely grate the fresh ginger.
Heat the toasted sesame oil in a wok or large non-stick skillet over medium-high heat.
Add the chicken strips to the pan and sear until they are cooked through and lightly golden on the edges.
Add the broccoli florets, sliced red bell pepper, and snap peas to the skillet.
Stir-fry the vegetables for 3-4 minutes until they are tender-crisp and bright in color.
Whisk the tamari, minced garlic, grated ginger, and red pepper flakes together in a small bowl.
Pour the sauce over the chicken and vegetables, tossing constantly for 1 minute until everything is well coated and aromatic.
Remove from heat and serve immediately while hot.