- Spray a 9x13" baking dish with non stick spray. 
- In a large mixing bowl, add one can of the chili, the cut hotdogs, and a half cup of cheese. Stir everything together until evenly combined. 
- Pour this mixture into the prepared baking dish, and spread it out evenly. 
- Spread the cheese slices evenly out over the top. 
- Pour the second can of chili evenly out over the top, gently spreading it, but being careful not to disturb the sliced cheese. 
- Sprinkle half a cup of the shredded cheese evenly out over top of the chili layer. 
- Open the biscuits and separate them. Cut each raw biscuit into four quarters, and spread the pieces evenly out over the casserole. Sprinkle a half cup of cheese evenly out over the biscuit layer. 
- Bake the dish at 375° for 25 minutes. 
- Carefully remove the dish from the oven, cover it with aluminum foil, and bake an additional 10 minutes. 
- Remove the dish carefully from the oven, take off the foil, and let it rest for five full minutes. 
- Top the casserole with a drizzle of mustard & ketchup, dill pickle relish, and chopped white onion. 
- Serve & enjoy!