Place marinara in a microwave-safe measuring cup. Microwave at HIGH for 2 minutes or until hot; keep warm.
Place flour in a shallow dish.
Place eggs in another dish.
Place panko in another.
Sprinkle eggplant evenly with salt. Dredge both sides of eggplant slices in flour; dip in egg, and dredge in panko.
Place breaded eggplant slices on a baking sheet coated with cooking spray. Broil eggplant 3 minutes on each side or until lightly browned.
Transfer eggplant slices to a plate.
Place bread slices on baking sheet; top each slice with 1 basil leaf.
Place 1 eggplant slice over each leaf; top eggplant with 1 basil leaf and 1/2 ounce cheese. Top cheese with remaining slices of eggplant; finish with 1/2 ounce of cheese over each eggplant slice. Broil eggplant stacks 3 minutes or until cheese is lightly browned and bubbly. Spoon 2 tablespoons marinara over each serving. Top with remaining basil leaves.