Cook bacon in a large nonstick skillet over medium heat until crisp. Remove bacon from pan, reserving 2 teaspoons drippings. Set bacon and drippings aside.
Combine cornmeal, cheese, and pepper in a shallow dish. Dredge tomato slices in cornmeal mixture. Heat 1 teaspoon reserved drippings and 1 teaspoon oil in a large nonstick skillet coated with cooking spray over medium-high heat. Cook 6 tomato slices 2 minutes on each side or until lightly browned. Repeat procedure with remaining 1 teaspoon bacon drippings, remaining 1 teaspoon oil, and 6 tomato slices.
Spread 1 tablespoon mayonnaise over each of 4 bread slices. Top each slice with 2 lettuce leaves, 3 tomato slices, and 2 bacon slices. Top with remaining 4 bread slices. Serve immediately.