Slice the chicken breast into thin, bite-sized strips and season evenly with sea salt and black pepper.
In a small mixing bowl, whisk together the gochujang paste, tamari, toasted sesame oil, and freshly grated ginger until smooth.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken strips to the hot pan and sear until golden brown and cooked through, approximately 5 to 6 minutes, then remove chicken and set aside.
In the same pan, add the broccoli florets, sliced red bell pepper, sugar snap peas, and minced garlic, stir-frying for 3 to 4 minutes until the vegetables are tender-crisp.
Return the cooked chicken to the pan and pour the gochujang sauce over the mixture.
Toss everything together for 1 minute until the sauce thickens slightly and coats the chicken and vegetables thoroughly.
Serve the hot stir-fry immediately over the portion of warm cooked brown rice.