In a large bowl, combine the shrimp, sausage, potatoes, chicken broth, melted butter, Cajun seasoning, garlic powder, and Old Bay seasoning. Toss to coat evenly.
Pour the mixture into a slow cooker.
Add the corn and onion wedges on top of the shrimp mixture.
Cover and cook on high for 2-3 hours, or until the potatoes are tender and the shrimp are cooked through.
Serve hot, with extra butter for dipping if desired.
Notes
This is a fantastic recipe for a casual get-together. Adjust the spice level to your preference.