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Prick sweet potatoes with a fork in several places. Microwave on High until tender all the way to the center, 12 to 15 minutes.
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Meanwhile, heat oil in a large nonstick skillet over medium-high heat. Add beef and cook, breaking it up with a wooden spoon, until lightly browned but not completely cooked through, 3 to 4 minutes. Using a slotted spoon, transfer the beef to a medium bowl, reserving drippings in the pan.
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Add onion to the pan; cook, stirring often, until softened, about 5 minutes. Add beans, chili powder, garlic powder and onion powder; cook, stirring constantly, until fragrant, about 30 seconds. Stir in tomato sauce, ketchup, Worcestershire, mustard and brown sugar. Return the beef to the pan. Bring to a simmer and cook, stirring often, until the beef is just cooked through and the sauce has thickened slightly, about 5 minutes.
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Cut the sweet potatoes in half lengthwise. Press open to make a well in the center of each half. Divide the mixture between the halves. Top with chopped pickle, if desired.
Tips
Tip: If you would like to make this recipe gluten-free, be sure to check the ingredients for the Worcestershire sauce to make sure it’s gluten-free.