Mushroom Pirozhki

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1. 1Step 1: Melt the butter in a large frying pan over medium heat.
2. 2Step 2: Add the chopped onion and saute until soft and translucent, about 5-8 minutes.
3. 3Step 3: Add the sliced shiitake mushrooms and saute until they are crisp and golden brown, about 10-15 minutes.
4. 4Step 4: Next, add the diced crimini mushrooms and saute until soft, about 10 minutes more.
5. 5Step 5: Add the white wine and let simmer for 5 minutes, until reduced by half.
6. 6Step 6: Remove from heat and stir in the sour cream. Season to taste with salt and pepper.
7. 7Step 7: Preheat the oven to 350F.
8. 8Step 8: Split the kulebyaka dough into twelve equally-sized pieces and roll them into balls.
9. 9Step 9: One at a time, roll a ball of dough into a thin circle about 4-5 inches in diameter.
10. 10Step 10: Place a heaping spoonful of mushroom filling in the center of the piece of dough.
11. 11Step 11: Brush the outer rim of the dough with the beaten egg yolk, then fold the dough over the filling into a half-moon shape.
12. 12Step 12: Firmly crimp the edges to form a dumpling and enclose the filling. Fold the round edge over once to prevent leaks.
13. 13Step 13: Place the pie on a baking sheet lined with parchment paper and brush the top with the egg yolk mixture.
14. 14Step 14: Repeat with the remaining dough and mushroom filling.
15. 15Step 15: Bake the pirozhki until golden brown on top, about 15 minutes.
16. 16Step 16: Remove from the oven and let cool for 5 minutes. Serve warm.