Slice the chicken breast into thin, bite-sized strips and season them evenly with sea salt and black pepper.
In a small mixing bowl, whisk together the tamari, gochujang, and toasted sesame oil until the sauce is smooth.
Heat the avocado oil in a large skillet or wok over medium-high heat until it begins to shimmer.
Add the chicken strips to the skillet and sear for 5-6 minutes, stirring occasionally until golden brown and fully cooked.
Remove the chicken from the pan and set it aside on a plate, keeping the remaining juices in the skillet.
Add the broccoli, bell pepper, and snap peas to the pan and sauté for 4 minutes until the vegetables are tender yet still crisp.
Stir in the minced garlic and grated fresh ginger, cooking for about 60 seconds until the aromatics are fragrant.
Return the cooked chicken to the skillet and pour the prepared ginger-garlic sauce over the mixture.
Toss everything together for 1-2 minutes until the sauce has thickened slightly and coated all ingredients.
Serve the hot stir-fry over a base of warm brown rice and garnish with white sesame seeds before serving.