Preheat your oven to 425 degrees Fahrenheit. Toss the chopped eggplant, potatoes, and pepper with the olive oil, smoked paprika, Greek spice blend, salt, and pepper. Roast for 35-40 minutes, stirring halfway through. If your chicken isn't cooked, cook it with the vegetables until the internal temperature reaches 165 degrees.
Meanwhile, whisk together the Greek yogurt, olive oil, and lemon juice in a bowl. Stir in the scallions and season with salt and pepper. If the dressing is too thick, whisk in a small amount of water (~1 teaspoon at a time) until desired consistency is achieved.
Divide the salad greens, vegetables, and chicken between two bowls and drizzle with the dressing.