Preheat oven to 450 degrees. Line a baking sheet with tin foil.
Toss the vegetables with the olive oil on the baking sheet and sprinkle with garlic salt. Cook for 25-30 minutes, stirring halfway through, until the vegetables are soft and the edges are beginning to blacken.
Spread 1-2 Tablespoons of pesto on each of the naan breads, then top with the roasted vegetables and finish with the mozzarella balls and the Parmesan cheese.
Turn the oven broiler on low and cook the assembled pizzas for 3-5 minutes, until the cheese is melted and bubbly and the naan breads are warm. Serve immediately.