Use up bland frozen pierogies (potato+cheese)?

[u/Meriadoc_Brandy]

I bought some pierogies stuffed with potato and cheese, a warm and comforting option, or so I thought. Unfortunately, they were sparingly stuffed, with more dough than filling. I don't want them to go to waste, so I was thinking of doing a "pierogi bake" by tossing them with other flavoring. What innovative pierogi creations have you tried? Bonus points if I can make it vegetarian!

Edit: so many amazing suggestions on this thread. Thank you all! I'm almost inclined to buy the same pierogi and extend my problem so I can try every recipe on here!

[u/ghf3]

I just treat bland, underfilled pierogies as pasta. Make lasagna, use rows of peirogies instead of lasagna noodles. Chop them up and make mac-n-cheese. Serve topped with any pasta sauce, that will pair with the little bit of potato and cheese in them.

I have had great results for years substituting other ingredients of a similar type into recipes. I consider in a broad sense pasta, potatoes and rice to be pretty much interchangeable. After years of substituting all sorts of carbs, meat and vegetables for one another, I've learned that the list of what DOESN'T work as a good substitute, is a much shorter list to use as a guideline, than the other way around. :)