Toss eggplant, peppers, and onion in a large bowl with 2 tbsp of olive oil and salt and pepper. Spread out amongst two rimmed baking sheets and pop into a 425 degree oven for 30-40 minutes stirring once half way through.
While the veggies are roasting, cook the orzo according to the package directions.
In the meantime combine lemon juice, balsamic vinegar, and 2 tbsp of olive oil in a small bowl. Whisk everything together and season with salt and pepper.
Once the veggies and orzo have cooked toss them together in a large bowl and pour vinegar mixture over the top. Combine well.
Finish the salad with scallions, mozzarella, tomatoes, and basil. Adjust seasonings and serve at room temperature. Enjoy!