Heat oil in a large skillet. Add onion and sauté until translucent. Add red pepper and sauté unti softened. Set aside.

Add beef to skillet and cook until browned, breaking into small pieces as it cooks. Drain excess liquid, then add adobo spice. Add sautéed onion and pepper, along with diced tomatoes, tomato sauce, corn, and black beans. Let simmer for a few more minutes. Serve in warmed or charred soft tortillas or hard taco shells and top with red cabbage, guacamole, jalapeños, salsa, or cilantro.