Pierogi bake casserole

Preheat the oven to 375 degrees.

Bring a large pot of salted water to a boil.

Cook the bacon in a large skillet over high heat. When browned, remove the bacon and set on paper towels. Drain off the grease.

Reduce the heat to medium. Add the butter to the same pan, then add the onions. Cook until soft and slightly browned, about 10 minutes. Set aside.

Add 8-10 pierogi to the pot of boiling water, stirring to ensure they don't stick. When they float to the surface, add a tablespoon of bacon fat to the skillet, still over medium heat, and use a slotted spoon to add the pierogi to the skillet. Brown on each side, then remove and place in a 9x13 inch casserole dish.

Repeat until all of the pierogi are cooked.

Add the bacon, onions, pepper, and half of the sour cream to the pierogi, and toss to combine.

Top with cheese and bake for 20 minutes, or until the cheese is melted.

Top with dollops of the remaining sour cream and the green onions.