Cook pasta according to package directions. Drain, rinse with cold water and allow to cool completely.
Lightly steam or blanch the broccoli florets until bright green and just tender. Set aside to cool.
In a large bowl, combine the cooled pasta, broccoli, cherry tomatoes, cucumbers or zucchini, bell peppers and grated red onion.
In a small bowl or blender, whisk together the lemon juice, minced garlic, oregano, parsley, nutritional yeast, crushed red pepper flakes, water or unsweetened plant milk and salt until well combined.
Pour the dressing over the pasta mixture and toss until everything is evenly coated.
Chill for 20–30 minutes before serving to allow the flavors to come together.
Garnish with extra parsley or a sprinkle of nutritional yeast if desired.