In a glass bowl, add chopped onions, tomatoes, green chilies, shredded mozzarella, oregano, red chili flakes, salt, and pepper.
Take a slice of bread, apply butter, and spread the chili cheese mixture evenly. Make sure to keep most of the batter in the center as the cheese may fall from the sides after melting.
Preheat the pan for 30 seconds on medium flame, then lower it.
Place the bread in the pan, and toast it for 5-7 minutes on low heat till the cheese has melted.
Finally, sprinkle some oregano and red chili flakes as the finishing touch.
Your chilli cheese toast is ready to be served hot.