Use a large skillet and cook the ground beef over medium heat until cooked through. Use a wooden spoon to break up meat. Transfer the beef into a colandar and drain the excess fat.
Add the beef back to the skillet and combine with drained black beans and salsa. Simmer for about 5 minutes until the mixture is heated, stirring occasionally.
Building The Taco Casserole
Cover a 2-quart casserole dish with the coarsely crushed tortilla chips. Layer the beef mixture over the tortilla chips. Add a thin layer of sour cream. Sprinkle with Cheddar and Monterrey Jack cheese and top with diced tomato.
Bake the casserole with 20 minutes at 350° Fahrenheit until the cheese has melted and is bubbly.
Serving The Casserole
Remove the Taco Casserole from the oven and serve on a bed of shredded lettuce. Top with sliced olives, sliced green onions, and a dollop of sour cream.