As requested, here is the recipe for wrenikje (cottage cheese perogies) that I got from my mom who makes awesome perogies.
4 cups flour
2 cups light sour cream (1 small container)
2 egg whites
4 cups dry curd cottage cheese (1 large container)
2 egg yolks
salt & pepper to taste (1 - 2 tsp)
Mix dough ingredients (love my KitchenAid!), roll out, top with filling, cut & seal (love my perogy cutter!). If you freeze them first there should be less chance of them opening up.
Then boil and serve if you like them that way. Or boil and fry if you like them that way. I fry mine just using Pam so I can pretend it's healthy.
With the leftover dough, we make empties - boiled and fried as well - we nicknamed them "heart attacks".
Last time I made these the recipe made 46 perogies and 8 "heart attacks" - enough for 2 meals for our family (when I make them alongside farmer sausage and corn)
2 tbsp margarine
2 tbsp flour
milk (may 1 1/2 cups?)
salt and pepper to taste
Melt margarine in a saucepan on medium heat, add flour to form a roux, stirring like this for one or two minutes to "cook" the flour. While whisking the entire time, slowly add milk. Stir continuously (or milk will burn) until it boils at which point gravy will thicken. If it is too thick, gradually add more milk until it is the desired consistency. Add in sausage drippings (if you have) and season to taste.
Serve over perogies, noodles or rice.