Season the chicken pieces with salt, pepper, and minced garlic.
Heat a large skillet with a lid over medium heat. Add the coconut oil.
Add the seasoned chicken and cook uncovered, turning occasionally, until the chicken is semi-firm and starting to brown (about 5 minutes).
Add the broccoli florets, diced red bell pepper, green onions, chili garlic sauce, and water. Stir to combine.
Bring to a simmer, cover, and cook for 3 minutes, stirring occasionally.
Uncover and stir in the keto brown sugar, soy sauce, rice wine vinegar, and xanthan gum.
Bring to a boil and let the sauce reduce slightly for about 4 minutes until thickened.
Stir in the chopped cashews and cook for another 2 minutes.
Drizzle with sesame oil and sprinkle with extra green onions.
Serve hot over a bed of heated cauliflower rice.