Heat oil in medium saucepan over medium-high heat. Add onions, pimiento, green bell pepper and garlic. Cook, stirring occasionally, until onions are soft and translucent, 5-7 minutes.
Stir in tomato sauce, Recaito, oregano, Sazón and cumin. Cook, stirring occasionally, until tomato mixture begins to boil, about 2 minutes more.
Stir in beans and 3 cups water; bring bean mixture to boil. Reduce heat to medium low. Simmer, stirring occasionally, until bean mixture thickens, about 10 minutes. Season with Adobo. Stir in cooked ham, squash or yautia, if desired. Serve warm.