Poke holes in the potatoes with a fork, and cook on your microwave’s potato setting until the potatoes are soft and cooked through (approximately 8-10 minutes on high for 4 potatoes). Alternatively, you may bake at 400 degrees F for 45-50 minutes or until tender. (May take longer if potatoes are very large.)
Heat the olive oil in a medium to large size skillet over medium heat. Add the onions and sauté until softened, 2-3 minutes. Add the sausage and cook until browned, breaking it up as you go.
Stir in the chili powder, cumin, and salt, and cook for 30 seconds more or until fragrant. Add the black beans, stir to combine, and continue to cook a minute or two more or until the mixture is heated through.
Slice the potato down the middle (lengthwise), and use a fork to gently loosen and mash the insides. (Gently push in from each end to open the potato wider in the middle. For added creaminess, I sometimes mash a tablespoon or two of Greek yogurt or sour cream into the flesh before stuffing.) Top with one quarter of the black bean mixture, 2 tablespoons each shredded cheese, Greek yogurt or sour cream, and salsa. Add optional toppings of choice and enjoy!