1To make the biscuits, heat oven to 450ºF. Stir ingredients until soft dough forms. Turn onto surface dusted with Bisquick mix. Knead 10 times. Roll dough 1/2 inch thick. Cut with 2 1/2-inch cutter. Place on ungreased cookie sheet. Bake 8 to 10 minutes or until golden brown.
2Next, Heat gas or charcoal grill. Add beef to large bowl, and season with salt and pepper. Shape beef into 4 equal patties. Place on grill over medium-high heat. Close grill; cook to desired doneness. I cook mine about 4 minutes per side, but it will depend on how thick your burgers are. Remove from grill, and keep warm while you make cheese sauce.
3To make cheese sauce, melt butter in 1-quart saucepan over medium-high heat. Stir in flour; cook about 1 minute. Beat in milk and mustard with whisk. Heat to bubbling, and let thicken, about 2 minutes. Turn off heat, and stir in provolone cheese, Cheddar cheese and a pinch of salt and pepper. Stir until cheese is melted.
4To assemble burgers, split biscuits in half and place a burger patty on the bottom of each biscuit. Top each burger with about 1/4 cup of hot chili, then carefully drizzle on the warm cheese sauce. Finish the burgers with warm crispy onion rings and corn chips. Top with the top half of the biscuit, and enjoy!