Preheat the oven to 350°F (177ºC). Spray a 9X13-inch baking dish with nonstick cooking spray.
Cook the pasta (1 pound) in well-salted water, according to package instructions. Drain and dry the pot.
Add alfredo sauce (2 cans), sour cream (1 cup), milk (1 cup), dry ranch dressing mix (1 envelope), dill (1 teaspoon), 1 cup Mozzarella, 1 cup cheddar, and bacon (6 slices) to the pot dried pasta pot and stir to combine. Add pasta and chicken (3-4 cups) and stir until evenly coated.
Pour mixture into prepared baking dish. Sprinkle top evenly with the remaining 1 cup of Mozzarella and 1 cup of cheddar. Bake in the preheated oven until it is heated through and bubbly, about 25-30 minutes. Serve.
Notes
Pasta: First and foremost, salt your pasta water. I find that a tablespoon to a tablespoon and a half is sufficient for about 4 quarts of water. Salting your pasta water doesn’t have anything to do with raising the temperature of the water or making it boil more quickly. It's really all about flavor!
The pasta absorbs some of the water as it cooks. If that water is well-seasoned, then it only stands to reason that your pasta will be too!
Bacon: This chicken bacon ranch pasta calls for cooked bacon. By all means, cook it however you are comfortable (stovetop or oven). The main this is that you want it crispy and you want to dab the grease off with a paper towel. This small step will help ensure your casserole isn’t greasy.
Rest: Last, you’ll want to let your chicken bacon ranch pasta rest for about ten minutes before serving. This gives all the flavors time to setup for an out-of-this-world amazing dish.