Heat olive oil in a pan and sauté the mushrooms. When they are partially cooked, add cabbage and continue to cook.
Once the cabbage softens, add green chili peppers, oyster sauce, and black pepper to season.
Pour eggs over the mixture and stir. (Taste and if it's bland, you can optionally add salt and soy sauce.)
You can either stir-fry rice with the ingredients or pour the mixture over cooked rice.