1. Prepare the Crockpot: Begin by spraying the inner pot of your crockpot with cooking spray for easy cleanup.
2. Add Ingredients: Layer the ingredients in the following order: sliced kielbasa, chopped onion, minced garlic, and drained sauerkraut.
3. Include the Pierogi: Gently place the frozen pierogi over the layered ingredients. You can arrange them in a concentric circle or simply scatter them.
4. Mix the Sauce: In a bowl, combine sour cream, vegetable broth, paprika, salt, and black pepper. Stir until smooth.
5. Pour Sauce: Pour this mixture over the layered ingredients in the crockpot, ensuring all pierogi are covered.
6. Add Cheese: Sprinkle the shredded cheese on top.
7. Cover and Cook: Secure the lid on the crockpot. Cook on low for 6 to 8 hours or on high for 3 to 4 hours, depending on your schedule.
8. Check for Doneness: About 30 minutes before serving, check the pierogi for doneness. They should be tender.
9. Garnish: Once done, sprinkle with fresh parsley if desired for a pop of color before serving.

These steps will allow you to prepare an incredible meal effortlessly.