With a paper towel, wipe the skillet until it is mostly clean. Dice the bell peppers and onion. Heat the remaining Tablespoon of olive oil over medium-high heat. Add the bell peppers, onion, basil, salt, and pepper. Cook until the onion begins to soften and brown, about 3 minutes. Add the cooked rice, garlic, and red pepper flakes, stirring to coat the rice. Cook until fragrant about 30 seconds. Add the chicken stock & canned tomatoes (drained), stirring well. Bring to a boil, stir again, then cover and simmer on low heat for 5 minutes.