1 lb dried pinto beans, soaked
2 tbsp olive oil
2 tbsp taco seasoning (I cheated here)
Soak beans overnight, then boil in fresh water until soft. Heat olive oil in a large skillet over medium heat, add cooked beans, and mash. Add taco seasoning, and cook until heated through.
Many other things can be added, including chiles, onions, cheese, but this is a basic recipe.