Add the chickpeas, oil & cajun seasoning to a baking sheet and toss to coat. Place in the oven for 20 minutes, tossing halfway. Remove from the oven and allow to cool.
While the chickpeas are roasting, bring a large pot of water to a boil. Add the pasta and cook according to the package instructions. Drain and rinse with cold water.
Add all of the dressing ingredients to a food processor and blend until smooth. Taste and adjust the seasonings as needed. Set aside.
To assemble, add the pasta, romaine, red onion and vegan parmesan to a large bowl. Drizzle with the dressing and toss to coat. Top with the chickpeas & avocado, serve and enjoy.
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Notes
This is best served right away so the lettuce doesn't wilt. If making ahead of time, wait to add the romaine and avocado until right before serving.