In a pot, boil about 1 inch of water. Place steamer basket on top of pot and place sweet potatoes in the basket. Cover and cook for 25-30 minutes or until sweet potatoes are fork tender. Remove and set aside.

Meanwhile, in a large skillet, heat oil over medium heat. Add onion and bell pepper and saute until onions are soft and translucent.

Add tomatoes, black beans, maple syrup, mustard, garlic powder, salt, and pepper and stir to combine. Bring to a simmer and allow to cook, uncovered for about 10-15 minutes or until tomato juices have reduced and the mixture has thickened.