Step 1

Spray casserole sized slow cooker (or at least a 5 quart) with non-stick cooking spray.

Step 2

In saucepan melt butter & saute onion until translucent.

Step 3

Stir in whipping cream and White Balsamic Vinegar.

Step 4

Add bacon to mixture & reduce heat to low, simmer 3-5 minutes.

Step 5

Stir in 1 cup of shredded Muenster cheese and sour cream. Remove from heat.

Step 6

In slow cooker add smoked sausage, layer one box of pierogi on top.

Step 7

Spoon 1/2 of cheese mixture over pierogi, and 1/2 of remaining shredded cheese.

Step 8

Repeat layers beginning with second box of pierogi.

Step 9

Place lid on slow cooker. Cook on high 4 hours, stirring once to combine mixture.