Season the chicken breast evenly with sea salt, black pepper, and garlic powder.
Heat the olive oil in a large skillet over medium-high heat.
Add the chicken to the skillet and cook for 5-6 minutes per side until golden brown and cooked through.
Remove the chicken from the pan, let it rest for a few minutes, then dice it into bite-sized pieces.
In the same skillet, add the cauliflower rice, diced celery, and shredded carrots.
Sauté the vegetables for 5-7 minutes until the cauliflower rice is tender and the moisture has evaporated.
Return the diced chicken to the skillet and pour the buffalo sauce over the mixture, tossing well to coat everything.
Transfer the mixture to a bowl and top with sliced avocado and a dollop of Greek yogurt.
Garnish with sliced green onions and serve immediately while hot.