Cook brown rice according to package instructions and set aside.
Dice chicken breast into 1-inch cubes and season with garlic powder, ginger powder, sea salt, and black pepper.
Heat avocado oil in a large skillet over medium-high heat.
Add chicken to the skillet and sauté until golden brown and cooked through, about 5-7 minutes.
Remove chicken from the pan and add diced bell peppers and onions, cooking until tender-crisp.
Stir in pineapple chunks, coconut aminos, rice vinegar, and honey, simmering for 2 minutes until the sauce thickens slightly.
Return chicken to the pan and toss to coat thoroughly in the glaze.
Serve the sweet and sour chicken over the warm brown rice.