- Cook chopped bell peppers and onion on griddle until translucent, about 10 minutes. Remove and set aside. 
- Season steak with salt, pepper, and garlic. Cook on griddle for 6-8 minutes. 
- Combine soy sauce, brown sugar, oyster sauce, rice wine vinegar, sesame oil, garlic paste, ginger paste, red pepper flakes, and water to make sauce. 
- Add veggies back to the griddle with the steak, pour in sauce, and cook until caramelized. Remove mixture from griddle. 
- Clean griddle surface with water and add avocado oil. 
- Place tortilla on griddle, warm for 60-90 seconds, flip, and add cheese, pepper steak mixture, chipotle mayo or sour cream, and more cheese. Fold into quesadilla. 
- Toast until golden brown, cut, and serve.