Peel the sweet potato and dice into small 0.5-inch cubes to ensure even cooking.
Heat the olive oil in a large non-stick skillet over medium-high heat.
Add the ground beef to the skillet and cook until browned, using a spatula to break it into small crumbles.
Stir in the diced yellow onion and red bell pepper, sautéing for 3-4 minutes until the vegetables begin to soften.
Add the diced sweet potatoes, rinsed black beans, tomato sauce, water, chili powder, cumin, and garlic powder to the skillet.
Stir well to combine all ingredients, then reduce the heat to medium-low and cover the skillet with a lid.
Simmer for 12-15 minutes, or until the sweet potatoes are fork-tender and the sauce has thickened.
Remove the lid and season with sea salt and black pepper.
Serve immediately while hot, directly from the skillet.