Calorie count is for 1 batch of chicken ropa vieja. It does not include any fix-ins like tortilla, lettuce, or cheese.
In a large skillet, heat the olive oil over medium heat until shimmering. Add the peppers and onions and saute until softened. Reduce the heat to low and pour the tomato puree over the softened peppers. Bring to a simmer for 5 minutes, until slightly reduced. Nestle in the breast fillets. Cover and cook for 8 to 10 minutes, until the breasts are cooked through.
Off the heat and remove the chicken to a cutting board. Shred the chicken using two forks. Add the chicken back to the skillet and stir to evenly distribute. Heat over low heat until chicken is heated through. Season with salt and pepper to taste.
*Decrease to 1/4 can if you don't like it too spicy.