1. Combine beef, breadcrumbs, egg, 1/4 cup of the tomato sauce, salt, chili powder and cayenne pepper. Press into a 9-inch pie pan; bake at 350 degrees F. for 10 minutes.
2. Top with the thawed mixed vegetables; add remainder of the tomato sauce and continue baking for 30 minutes longer. Sprinkle shredded cheese over top and bake until cheese melts.