Preheat toaster oven to 350°F.

Drizzle 2 tablespoons olive oil over the baking tray and tilt to coat.

In a large bowl, combine ground beef, bread crumbs, 1/2 cup pesto, egg, salt, and pepper.

Mix with hands until just combined.

Shape the mixture into 12 meatballs, about 1/4 cup each.

Transfer meatballs to the prepared baking tray.

Bake for 15 minutes.

Turn the meatballs.

Bake for another 10 minutes, or until cooked through.

Meanwhile, prepare couscous according to package directions.

In a small bowl, combine the remaining pesto and 3 tablespoons olive oil.

Spoon the pesto mixture over the cooked meatballs and turn to coat.

Divide the meatballs and couscous among individual plates.

Sprinkle with Parmesan cheese (if using) and serve.