Heat avocado oil in a large skillet over medium-high heat.
Season diced chicken with sea salt and black pepper, then add to the skillet.
Cook chicken for 5-6 minutes until golden brown and cooked through.
Stir in the diced red bell peppers and shredded carrots, sautéing for 2 minutes until slightly softened.
In a small bowl, whisk together sweet chili sauce, tamari, honey, grated ginger, and minced garlic.
Pour the sauce over the chicken and vegetables, tossing to coat until the glaze is thick and bubbly.
Remove from heat and let the mixture rest for a minute.
Spoon the chicken mixture into the center of each butter lettuce leaf.
Garnish with chopped cashews and sliced green onions before serving.