Polish Potato & Cheese Pierogi with Caramelized Onions

Step 1

Mix flour and salt in a bowl. Make a well in the center and crack in the egg.

Step 2

Gradually stir flour into the egg, then knead with your hands until a stiff dough forms, ~3 min.

Step 3

Cover dough and let rest at room temperature while you prepare filling.

Step 4

Cut potatoes into 2-inch chunks and boil in salted water until fork-tender, ~12 min.

Step 5

Drain potatoes and mash with a fork until smooth. Stir in cheese until melted.

Step 6

Slice onion into thin half-moons. Melt butter in a skillet over medium heat.

Step 7

Add onions and cook, stirring occasionally, until golden and very soft, ~15 min.

Step 8

Roll dough thin on a floured surface. Cut into 3-inch circles using a cup or cutter.

Step 9

Place 1 tbsp filling on each circle, fold in half, and press edges to seal tightly.

Step 10

Bring a large pot of salted water to a boil. Add pierogi in batches.

Step 11

Cook until pierogi float, then simmer 2 minutes more. Remove with a slotted spoon.

Step 12

Serve pierogi topped with caramelized onions and a dollop of sour cream.