2. Mix the olive oil, garlic, salt, pepper and 1/2 teaspoon of the basil together. Slice the eggplants lengthwise into 1/2" slices. Brush the slices on both sides with the olive oil mixture.
3. Grill the eggplant slices until they become soft in the center, about 2 to 3 minutes on each side.
For the sandwiches:
4. Mix the cheese, the remaining teaspoon of basil, salt and pepper together. Set aside.
5. Spread 4 halves of bread with the cheese mixture, then top with the spinach or arugula, a slice of tomato and a few slices of eggplant. Place the other half of the bread on top.