Heat the olive oil in a wok or a large skillet with high sides over medium high heat. Add the pork to the hot oil 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 (or coconut aminos). Continue to stir fry on medium heat 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!