Heat 1.5 to 2 spoons of olive oil in a pan.
Cook the mushrooms over low to medium heat. If you use high heat, the oil will be quickly absorbed and you'll end up using a lot.
Once the mushrooms start to release moisture, add the cherry tomatoes and sauté together for about 5 minutes.
Add one spoonful each of oyster sauce and soy sauce to the stir-fried ingredients, and cook together for another 5 minutes. That's it!