3. In a large bowl, toss frozen pierogi and onion wedges with half of the melted butter and a pinch of salt and pepper; arrange on the baking sheet with the cabbage. Add kielbasa to the baking sheet.
If you’ve never tasted kielbasa, it’s a thick, salty, and savory sausage packed with rich and smoky flavor, and is typically made with a blend of pork, beef, and spices like garlic and pepper.