Pat the chicken breast dry with a paper towel and cut into 1-inch cubes, then toss in a bowl with cornstarch, sea salt, and black pepper until evenly coated.
In a small glass jar or bowl, whisk together the honey, tamari, and minced garlic until the honey is fully incorporated into the liquid.
Heat the avocado oil in a large non-stick skillet over medium-high heat, then add the chicken in a single layer, searing for 3-4 minutes per side until golden brown and crispy.
While the chicken cooks, place the broccoli florets in a steamer basket over boiling water for 4-5 minutes until they reach a tender-crisp texture and bright green color.
Reduce the skillet heat to medium-low and pour the honey-garlic sauce over the crispy chicken, stirring constantly for 1-2 minutes until the glaze thickens and coats every piece.
Divide the cooked white rice into bowls, top with the glazed chicken and steamed broccoli, and finish with a sprinkle of sesame seeds for a clean, restaurant-quality meal.