Tailgate Crock Pot Pierogies with Keilbasa, Bacon, and Onions

First thing want to do is lightly spray the crock pot with a cooking spray, this help with the pierogies sticking to the crock pot. After that, place 4 tablespoons of the butter in the crock pot, and turn the crock pot on high. This is going to melt the butter.Next, melt the rest the butter in a fry pan and saute the onions, saute them till they are just starting to get golden.Once the onions are starting to turn golden, add the bacon to the onions, and let them cook for about a minute together, stir constantly in that minute.Next, add the balsamic vinegar and heavy cream to the onion mixture. reduce the heat and let it simmer for 3-5 minutes. make sure your stirring so you do not burn.Next add the muenster cheese to the sauce and turn the heat off. You just want it to melt into it, takes about a minute for this. stir and set the sauce aside. You can use another cheese, I happen to have this cheese and I was surprised how good it made the sauce.The butter should be melted or half way there in the crock pot, add the kielbasa to the crock pot.Layer the pierogies on top the kielbasa. I like to use both potato and sauerkraut, that just a taste thing but you can use all potato kinds if you choose.Pour the onion mixture on top the pierogiesTop it off with the sour cream. Cover and let it cook on high for about 4 hours. Half way to cooking give the crock pot a stir, so the butter comes up and the sauce is coming down. Plus it helps with the pierogies sticking.Take some out the pot and ENJOY!