Wash all vegetables thoroughly. Chop the onion, green bell pepper, and red bell pepper into small pieces. Peel and chop the garlic cloves, and chop the cilantro finely.
In a large skillet, pour in the olive oil and heat it over medium heat until warm but not smoking.
Add the chopped onion, green bell pepper, and red bell pepper to the skillet. Stir gently for about 5-7 minutes until soft and translucent.
Add the garlic to the skillet and stir continuously for about 1-2 minutes, ensuring it doesn’t burn.
Mix in the chopped cilantro and stir for another minute to release the flavors.
Remove from heat and allow the Sofrito to cool before transferring to a storage container.