MUSHROOM FILLING FOR PEROGIES

Why I Love This Recipe
There are many fillings for perogies and this is another variation for the other recipe I have entered.
Ingredients You'll Need
1 small onion, chopped fine
2 to 3 tablespoons butter
2 cups chopped cooked mushrooms
Salt and pepper
2 egg yolks
Directions
Cook the onion in the butter until tender. Add the mushrooms and cook together for about 10 minutes. Season to taste with salt and pepper. Remove the mixture from the range and beat in the egg yolks. Chopped dill may be added for flavor, if desired. Cool the mixture thoroughly.