Prepare the Seasoning & Relish: In a small bowl, whisk together the garlic powder, black pepper, and salt.
In a separate bowl, create the tomato relish by combining half of this seasoning mix with the chopped tomato, 1 tablespoon (15 ml / 0.5 fl oz) of olive oil, fresh oregano, thyme, and cider vinegar.
Set aside to let the flavors meld.
Season the Eggplant: Brush both sides of each eggplant slice with the remaining 1 tablespoon (15 ml / 0.5 fl oz) of olive oil.
Sprinkle the remaining garlic seasoning mixture evenly over both sides of the oiled slices.
Grill the Eggplant: Preheat your grill to medium heat.
Place the seasoned eggplant slices directly on the grates.
Grill for 6-8 minutes, flipping once, until tender and beautifully golden with grill marks. During the final 2 minutes of cooking, top each eggplant slice with a slice of smoked Gouda cheese and allow it to melt.
Assemble & Serve: Place one cheesy grilled eggplant slice onto each piece of toasted baguette. Spoon the fresh tomato relish over the top and serve immediately.
Don't have smoked Gouda? Smoked mozzarella, provolone, or even a sharp cheddar would be delicious substitutes.