Boil a large pot of salted water and cook the fettuccine pasta according to the package instructions. Drain and set aside.
Season the diced chicken and shrimp with salt, black pepper, garlic powder, and paprika.
Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. Add the shrimp and cook for 2 to 3 minutes per side until pink and cooked through. Remove shrimp from the skillet and set aside.
In the same skillet, add the remaining 1 tablespoon of olive oil and the diced chicken. Cook for 5 to 7 minutes until golden brown and fully cooked. Remove chicken and set aside with the shrimp.
Reduce the heat to medium. Add the butter to the skillet and let it melt. Add the minced garlic and sauté for 1 minute until fragrant.
Pour in the heavy whipping cream and bring to a gentle simmer. Let it cook for 2 to 3 minutes to thicken slightly.
Gradually whisk in the grated Parmesan cheese until the sauce is smooth and creamy.
Return the cooked chicken and shrimp to the skillet, tossing them in the Alfredo sauce.
Add the cooked fettuccine pasta to the skillet and toss until the pasta is evenly coated with the sauce and proteins.
Garnish with fresh chopped parsley and serve immediately.
Notes
Store any leftovers in an airtight container in the refrigerator for up to 3 days. Reheat gently on the stovetop with a splash of milk or cream to restore the sauce's consistency.