In a small bowl, whisk together the fresh orange juice, orange zest, coconut aminos, rice vinegar, honey, ginger, garlic, and arrowroot powder until smooth.
Season the diced chicken breast evenly with sea salt and black pepper.
Heat the avocado oil in a large non-stick skillet over medium-high heat.
Add the chicken to the skillet and sear until golden brown and cooked through, approximately 6 to 8 minutes.
Remove the chicken from the skillet and set aside; add the green beans to the same pan with a tablespoon of water.
Cover the skillet and steam the green beans for 3 to 4 minutes until they are bright green and crisp-tender.
Return the chicken to the skillet and pour the orange sauce over the chicken and beans.
Toss constantly for 1 to 2 minutes until the glaze thickens into a glossy coating, then garnish with sesame seeds.