Combine three cups of chicken broth, frozen pierogies, cheddar cheese and kielbasa in a 4-6 quart crock pot. Cook on high 3-4 hours, or on low for 6 hours.
About thirty minutes before serving, warm up cream cheese with remaining one cup of the chicken broth in microwave until the cream cheese is warm. Or you can warm it up on the stove top. Whisk it together until smooth.
Pour this mixture into crock pot. Stir. Top with remaining one cup of cheese. Cover and cook on low for an additional 30 minutes. Then serve! Top with sliced green onions (optional)