Cook bacon and dry with paper towels, then crumble up to 24 hours before hand.
To prevent sticking, grease the inside of the crock pot with Pam or other non-stick cooking spray
In crock pot, combine softened cream cheese, sour cream, mustard and garlic powder until smooth.
Stir in beer, cheddar cheese and all but 2 tablespoons bacon. Cook, covered, on low, stirring occasionally, until heated through. Approximately 2-3 hours.
In last 30 minutes, stir in heavy cream. Top with onion and remaining bacon and serve with soft pretzel bites.