Step 1: Add the Smoked Sausage - Start by slicing your smoked sausage into rounds and spreading them across the bottom of a 6 quart slow cooker. There is no need to brown the sausage first unless you happen to want the extra color. The sausage is already cooked, so during its time in the slow cooker it will warm through, soften slightly, and release some of that smoky flavor into the sauce.
Step 2: Add the Onion Powder and Garlic - Sprinkle the onion powder over the sausage, then add the minced garlic. Give everything a quick stir if you want, but you do not need to fuss with it. These flavors will mingle with the liquid as the slow cooker heats, and the garlic will mellow into the sauce instead of tasting sharp.
Step 3: Pour in the Beer and Broth - Pour the beer and chicken broth evenly over the sausage. A mild lager is a comfortable choice for a family style beer cheese sauce because it gives you that familiar pub flavor without turning the sauce too bitter. The chicken broth keeps the mixture balanced and provides enough liquid for the cream cheese to melt into later.
Step 4: Add the Savory Seasonings - Stir in the Worcestershire sauce, Dijon mustard, and black pepper. These ingredients might seem small compared with all that sausage and cheese, but they matter. Worcestershire adds savory depth, Dijon brings a little tang, and black pepper gives the sauce gentle warmth. Together they keep the finished pasta from tasting like cheese and nothing else.
Step 5: Add the Cream Cheese and Slow Cook - Scatter the cubed cream cheese across the top. Cover the slow cooker and cook everything on LOW for 3 to 4 hours, or on HIGH for about 2 hours. I prefer LOW when the schedule allows because it gives everything plenty of time to warm together gently. You are looking for soft cream cheese and piping hot sausage surrounded by a fragrant broth.
Step 6: Stir the Cream Cheese Into the Sauce - Once the cooking time is up, remove the lid and stir the mixture thoroughly. The softened cream cheese should disappear into the beer and broth, turning everything creamy. Give it a minute if necessary and keep stirring until you no longer see large white pieces of cream cheese. It may look a little thinner than the final sauce at this point, which is exactly what you want.
Step 7: Melt in Both Cheddar Cheeses - Add the freshly shredded sharp cheddar and white cheddar a little at a time, stirring gently after each addition. The residual heat from the slow cooker should melt the cheese into a smooth, creamy sauce. Freshly shredded cheese makes a noticeable difference here because packaged shredded cheese often contains coatings that can keep it from melting as smoothly.
Step 8: Cook the Campanelle Pasta - While you are finishing the cheese sauce, bring a large pot of water to a boil and cook the campanelle according to the package directions until al dente. You want the pasta tender but still slightly firm in the center. Remember that it will spend a few more minutes sitting in the hot sauce, so cooking it until very soft at this stage can leave it mushy later.
Step 9: Combine the Pasta and Beer Cheese Sauce - Drain the pasta thoroughly, then add it directly to the slow cooker. Gently fold everything together until the campanelle is coated from top to bottom in that creamy beer cheese sauce. Take your time stirring so you do not break up the pasta. This is the point when dinner really comes together and the sauce settles into all those little folds and curves.
Step 10: Warm Through and Serve - Cover the slow cooker again and let everything cook for another 10 to 15 minutes, just until the pasta is hot and the sauce has settled into the right consistency. If it looks thicker than you like, stir in a small splash of chicken broth. Finish with chopped parsley and, if your family is anything like mine, set a little extra cheddar on the table for whoever wants another sprinkle.