Boil the lasagna noodles for 9 minutes in a pot of salted water. When cooked, drain and transfer to an ice bath for 1 minute. Lay out the noodles on a large cookie sheet and spray with cooking spray.
In a 4-inch-deep full-size hotel pan, spread a layer of the barbecue sauce over the bottom. Arrange 5 slightly overlapping noodles to fully cover the bottom of the dish. Then spread a layer of pulled pork, followed by 5 ounces of the barbecue sauce and 1 quart of cheese. Continue layering with 5 more noodles, followed by a layer of smoked chicken, 5 ounces of barbecue sauce and 1 quart of cheese. Then create another layer with 5 more noodles, followed by a layer of Cajun sausage, 5 ounces of barbecue sauce and 1 quart of cheese. Finish with the remaining noodles, the rest of the barbecue sauce and the last quart of cheese.
Bake, uncovered, until cooked through, about 30 minutes.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.