Bring a large saucepan filled halfway with water and a pinch of salt to a boil. Add broccoli and carrots and cook for 3 minutes; drain and rinse with cold water to stop cooking.Combine the vinegar, olive oil, Italian seasoning, mustard, salt, black pepper and garlic power in a screw top jar. Cover and shake well.In a large bowl combine the zucchini noodles, broccoli, carrots, diced tomatoes and yellow bell pepper. Shake dressing and pour over zucchini pasta mixture; toss gently to coat.