In pot with onions, add cooked beans, 2 tbsp olive oil, salt, chili powder, cumin, vinegar, cayenne pepper, onion powder, and garlic powder. Use an immersion blender to combine ingredients. Add reserved water from cooking beans, 1 tbsp at a time, until desired consistency is reached. For me, this took 4 tbsp of the water. Note: If you do not have an immersion blender, you may transfer the mixture to a blender or food processor.