Heat the olive oil in a wok or a large frying pan with high sides over medium-high heat. Add the pork and cook, stirring occasionally, until the pork is nicely browned on all sides, around 3-4 minutes.
Add bell pepper, green onion, ginger, cashews, and garlic powder. Season with salt and black pepper, to taste. Stir fry the veggies until they become crisp-tender, around 2-3 minutes.
Add the bok choy, sesame oil, and tamari. Continue to stir fry until the bok choy wilts and the other ingredients are coated, approximately 1-2 minutes.
Remove from heat and transfer to individual serving plates. Garnish with toasted sesame seeds, if desired, and serve immediately. Enjoy!
*Nutritional information for this recipe is based on using tamari, rather than coconut aminos.