Cook Pasta Al Dente:

Fill a large pot with water, bring to a boil, add salt generously, and cook the pasta until al dente following package instructions. Set aside 1-2 cups of pasta water before draining.

Season Shrimp and Chicken:

While the pasta cooks, dust the shrimp and chicken each with 1 tablespoon of Cajun spice.

Sauté Shrimp in Butter:

In a large pan or Dutch oven, heat the olive oil and melt half the butter. Add the shrimp and sauté over medium heat for 3-4 minutes, turning once halfway. Use tongs to transfer the shrimp to a plate.

Cook Chicken Thoroughly:

Place the chicken in the pan and cook for 5-6 minutes until fully done. Remove the chicken and set aside.

Make Creamy Cajun Sauce:

Add the remaining butter and garlic to the pan; cook for 1 minute until aromatic. Pour in the white wine to deglaze, then add the last tablespoon of Cajun seasoning. Reduce the heat and stir in the cream. If the sauce appears dry, incorporate some reserved pasta water. Let it simmer for 1-2 minutes until thickened, then turn off the heat and mix in the grated Parmesan.

Combine and Serve:

Return the shrimp and chicken to the pan, stirring to combine. Add the drained pasta and toss thoroughly to coat. Adjust seasoning to taste and serve right away.