Preheat oven to 350º F. Arrange half of tortilla chips in a single layer on the sheet pan. Top with half of each: brisket, cheese, and jalapeno. Repeat layer with remaining chips, brisket, cheese and jalapeno. Place in the oven until the cheese has melted, about 12 to 15 minutes. Remove from oven and top with tomato and avocado. Serve with optional toppings, if desired.