Step 1: Heat up the olive oil and sautée onion, chili peppers, and garlic.
Step 2: Add tomatoes, season with salt and pepper. Cook until soft.
Step 3: Mix in the mushrooms and cover the pan. Set the heat over medium-low and cook for about 8 minutes, mixing from time to time.
Step 4: Uncover the pan and allow the mixture to cook for an extra minute. Adjust salt and pepper to taste.