Bring a medium pot of salted water to a boil. Add the cheese tortellini and cook according to package instructions, usually around 3-5 minutes until tender but still firm. Drain and set aside, reserving a bit of pasta water for later.
Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. Toss the shrimp with 1 tablespoon of Cajun seasoning, ensuring they are evenly coated. Add the shrimp to the skillet and cook for 2-3 minutes on each side until pink and opaque. Remove shrimp from the skillet and set aside.
In the same skillet, add the remaining tablespoon of olive oil. Toss in the diced onion and bell pepper. Sauté for about 4-5 minutes until softened. Add the minced garlic and cook for another minute until fragrant.
Sprinkle the remaining Cajun seasoning over the vegetables and stir to combine. Pour in the chicken broth, scraping up any browned bits from the skillet. Let it simmer for 2 minutes, then add the heavy cream. Stir continuously until the sauce thickens slightly, about 3-4 minutes. Taste and adjust salt and pepper as needed.
Return the cooked shrimp to the skillet along with the drained tortellini. Toss everything gently to coat in the creamy Cajun sauce. If the sauce is too thick, add a splash of reserved pasta water to reach your desired consistency.
Sprinkle chopped fresh parsley over the top for a bright, herbaceous finish. Serve immediately and enjoy the perfect balance of creamy, spicy, and savory flavors.