In a mortar and pestle, crush the garlic until smooth. Add the oregano and continue grinding until the mixture forms a paste.
In a bowl, add the chicken, garlic and oregano paste, sofrito, garlic powder, onion powder, paprika, salt, and black pepper..
Heat oil in a pot over medium heat. Add sugar to the hot oil and let it caramelize.
Add the chicken to the pot and cook for 4-5 minutes, or until fully seared. Turn the chicken pieces and continue cooking for another 4-5 minutes, or until fully seared.
Add the remaining marinade, 2 cups hot water, and the tomato paste to the pot. Stir to combine and bring to a boil. Cover the pot, leaving a small gap for steam to escape, and cook for 25 minutes.
Add the red bell pepper, cubanelle pepper, yellow onion, and ½ cup hot water to the pot. Stir to combine, then cook uncovered until the vegetables are tender and the sauce thickens, about 15 minutes. If the sauce begins to dry out, add ¼ cup hot water.
Taste for salt and serve. Buen provecho!