Dice the chicken breast into bite-sized pieces and toss with arrowroot powder, sea salt, and black pepper.
Heat sesame oil in a large skillet or wok over medium-high heat.
Add chicken to the skillet and sear until golden brown and cooked through, about 5-7 minutes.
Remove chicken from the pan and set aside.
Add broccoli, sliced bell peppers, and snap peas to the same pan, sautéing until tender-crisp.
In a small bowl, whisk together orange juice, coconut aminos, minced ginger, and minced garlic.
Return chicken to the pan and pour the orange sauce over the mixture.
Toss everything together for 1-2 minutes until the sauce thickens and coats the ingredients.
Serve the stir-fry over the cooked brown rice and garnish with sesame seeds.