Note #1: This dip can be assembled in advance, up to 1 day, covered and refrigerated before baking. You may need to add 5 more minutes to the baking time - just keep an eye on it and bake until browned and bubbling.
Note #2: This can also be made in a slow cooker, although it will obviously not get browned. Place the cooked sausage along with all of the other ingredients in the slow cooker, stir and cook on high for 1 to 2 hours, until all of the cheeses are melted, stirring occasionally.

