Slice the chicken breast into 1-inch bite-sized pieces and season with sea salt and black pepper.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the pan in a single layer and sear for 4-5 minutes until golden brown and cooked through.
Remove the chicken from the pan and set aside, then add the broccoli florets and sliced red bell peppers to the same skillet.
Stir-fry the vegetables for 3-4 minutes until they are bright green and tender-crisp.
Stir in the minced garlic and grated ginger, cooking for 30 seconds until fragrant.
In a small bowl, whisk together the coconut aminos and sambal oelek, then pour the mixture into the skillet.
Return the chicken to the pan and toss everything together for 1 minute to coat in the spicy glaze.
In a separate small pan, quickly sauté the cauliflower rice and cooked brown rice together until heated through.
Plate the rice mixture and top with the chili-garlic chicken and vegetables, finishing with a drizzle of toasted sesame oil.