Put a little dollop of sauce in the bottom of each ramekin.
Lay a slice of eggplant on top of the sauce (larger slices of eggplant should be cut in half to make them fit)
Spoon the cheese filling on top of the eggplant.
Top the cheese filling with a second eggplant slice.
Add another dollop of sauce on top.
Cover each ramekin with aluminum foil and arrange the ramekins on a baking sheet. Bake at 375 °F for about 20 to 25 minutes.
Remove the aluminum foil, sprinkle on the remaining mozzarella cheese, and bake for another 7 or 8 minutes, until the cheese is brown and bubbly.