Roasted Sweet Potato with Garlic-Black Bean Sauce

canned black beans

½ cup(s), rinsed and drained

cilantro

1 tsp, fresh, chopped

garlic clove(s)

1 medium clove(s), minced

uncooked red onion(s)

2 Tbsp, minced

fat free sour cream

2 Tbsp

raw sweet potato(es)

1 large, roasted and cut in half