My neighbor Karen brought this over and we scraped the bowl clean. Comfort food at its finest. Just 4 ingredients.

4-Ingredient Sausage and Pierogies

Servings: 6 

Ingredients
2 pounds fully cooked smoked sausage or kielbasa, sliced into 1/2-inch rounds
2 (16-ounce) boxes frozen potato-and-cheese pierogies
1 large yellow onion, thinly sliced
1/2 cup (1 stick) unsalted butter, melted
Directions
Lightly grease the inside of a 5- to 6-quart slow cooker with a bit of butter or nonstick spray to help prevent sticking.
Spread the sliced onion evenly over the bottom of the slow cooker; this creates a flavorful bed that helps keep the pierogies from sticking and