Bring a large pot of water to a boil and add salt, garlic powder, and Italian herbs. Stir in the pasta and cook until just al dente according to the package instructions. Drain and rinse under cold water to cool it completely and stop the cooking process.
Slice zucchini, red bell pepper, and red onion into even pieces. Brush lightly with oil and grill until tender with slight char marks on both sides. Let them cool slightly, then chop into bite-sized pieces for easy mixing.
In a small bowl, combine olive oil, Dijon mustard, lemon juice, minced garlic, dried basil, salt, and black pepper. Whisk well until everything blends into a smooth dressing. Add water gradually if you prefer a thinner consistency.
In a large bowl, mix the cooled pasta with grilled vegetables, chopped tomatoes, chickpeas, and fresh basil. Pour the dressing over the mixture and toss gently until everything is well coated. Chill for at least 30 minutes before serving for best flavor.