POLISH PIEROGI

Steps:

• To make dough, mix flour, eggs, sour cream, salt and water (a little at a time). Knead dough until firm and elastic; cover and let rest 10 minutes. , For potato filling, combine ingredients; set aside. For cheese filling, combine ingredients; set aside. , Divide dough into 3 parts. On floured surface, roll dough to 1/8-in. thickness; cut into 3-in. rounds with cutter, rerolling dough as needed. Place 1 teaspoon filling in center of each round; fold and press edges together firmly to seal. , Dissolve bouillon cubes in water in large saucepan; add oil. Heat to a simmer over medium heat. Working in batches, drop pierogi into simmering water. Do not crowd. Simmer until tender, about 15 minutes, stirring gently with wooden spoon to prevent sticking. Remove with slotted spoon; drain well. , Melt butter in a large skillet over medium heat; add onion. Cook until lightly browned, 2-3 minutes. Add mushrooms; cook until tender, stirring occasionally, about 5 minutes. Place drained pierogi on serving platter. Top evenly with mushroom mixture.