Using a very sharp knife, gently cut cherry tomatoes into quarters and place into a bowl.
(Optional) Finely chop onion & Calabrian chili pepper and place into bowl with tomatoes.
Add olive oil, salt, and oregano and mix. Let sit for 30 minutes minimum to meld.
Toast bread in toaster or oven until the top is brown and crunchy. Let cool.
Evenly add tomato mixture onto bread. Garnish with one piece of basil and serve.
Buon Appetito!