Prep the eggplant: Heat oven to 425°F (220°C). Line a baking sheet with parchment.
Lay eggplant slices on the sheet.
Season: Brush both sides with olive oil. Sprinkle with oregano, smoked paprika, garlic powder, salt, and pepper.
Roast: Bake 18–22 minutes, flipping halfway, until tender and lightly browned. Let cool slightly.
Toast bread (optional): Lightly toast slices or warm the rolls for better texture and structure.
Make a quick herby finish: In a small bowl, mix lemon juice and red wine vinegar with the chopped parsley or basil.
Drizzle a little over the warm eggplant.
Assemble: Spread hummus on each bread slice. Layer on eggplant, cucumber, tomato, red onion, olives, and arugula. Sprinkle with feta.
Close and serve: Top with the second slice of bread.
Press gently, slice in half, and enjoy warm or at room temperature.