Heat olive oil in a large pan over medium-high heat.
Add onion and peppers. Saute for 4-5 minutes, stirring occasionally,
Add the mushrooms and broccoli slaw and saute for 4-5 minutes, stirring occasionally, until the broccoli slaw is wilted and tender.
Remove the veggies to a bowl and add the pork strips to the pan. Sprinkle with salt and pepper. Saute the pork for 2-3 minutes, flipping to cook both sides.
Add the garlic to the pan and saute for 30 more seconds.
Return the veggies to the pan and stir to get all of the ingredients mixed together.
Reduce heat to medium low, then add soy sauce and chili sauce, if using. Stir to combine everything with the sauce and let simmer for 1-2 minutes.
Serve hot over rice, if desired.