In a large bowl, combine the shrimp with 1 tablespoon of olive oil, minced garlic, and half of the Cajun seasoning. Toss together and allow to rest for about 10 minutes.

Heat the remaining olive oil in a large skillet over medium heat. Sprinkle in the other half of the Cajun seasoning and add zucchini and bell peppers. Sauté for 4-5 minutes until slightly softened.

Add the marinated shrimp to the skillet in a single layer. Cook for about 2 minutes until the bottom turns pink, then flip and continue cooking for 3 minutes until fully cooked.

Return the sautéed vegetables to the skillet with the cooked shrimp. Toss gently to coat and cook for another 3-4 minutes until heated through.