Preheat your oven to 200°C (392°F)
Thoroughly wash the tomatoes and dice them into even pieces.
Arrange the diced tomatoes in a baking tray, ensuring that you line it with aluminum foil for easy cleanup.
Season the tomatoes with salt, pepper, garlic powder, and oregano to enhance their flavor.
Generously drizzle olive oil over the seasoned tomatoes.
Place the tray in the oven and bake for a duration of 30 to 40 minutes.
For an ideal roasted texture, switch to broil for an additional 15 minutes.
Once done, serve the tomatoes immediately or store them in an airtight glass container for future use.