Pat the chicken breast dry with paper towels and cut into bite-sized 1-inch cubes.
In a small bowl, whisk together the gochujang, coconut aminos, sesame oil, garlic powder, and ginger powder until the sauce is smooth and emulsified.
Heat the avocado oil in a large skillet or wok over medium-high heat until it begins to shimmer.
Add the chicken cubes to the skillet in a single layer, seasoning them with the sea salt and black pepper.
Cook the chicken for 5-6 minutes, turning occasionally, until golden brown and the internal temperature reaches 165 degrees Fahrenheit.
Add the broccoli florets and thinly sliced red bell pepper to the skillet, sautéing for an additional 3-4 minutes until the vegetables are tender-crisp.
Pour the prepared spicy gochujang sauce over the chicken and vegetables, tossing constantly for 1 minute until the glaze is thick and glossy.
Place the warm cooked jasmine rice into a serving bowl and top it with the glazed chicken and vegetable mixture.
Garnish the bowl with sesame seeds and thinly sliced green onions before serving immediately.