Start by laying your sliced kielbasa into the bottom of a slow cooker, ensuring an even layer.
In a small mixing bowl, whisk together the brown sugar, ketchup, Worcestershire sauce, garlic powder, onion powder, and black pepper until well combined.
Pour this sweet and savory mixture over the kielbasa in the slow cooker. Toss gently to make sure each piece is coated in the sauce.
Cover the slow cooker and set it on low for 4-6 hours, allowing the kielbasa to become tender and the flavors to meld beautifully. Alternatively, cook on high for about 2-3 hours if you’re short on time.
Once done, give the kielbasa a gentle stir to coat with the sauce once more.
Serve warm, straight from the slow cooker, ensuring everyone gets plenty of that scrumptious sauce.
