Sauté shrimp seasoned with ½ a teaspoon of kosher salt and a few turns of freshly ground pepper just until they start to turn pink, 3-5 minutes.
Add garlic and continue to cook another minute.
Remove shrimp from pan and set aside to be added back in after pasta cooks.
Add chicken broth, heavy cream, and uncooked pasta to pan and stir.
Bring to a boil, then cover and reduce to a simmer.
Simmer for 15-20 minutes or until pasta is tender.
Remove from heat and stir in freshly shredded parmesan cheese.
Stir in sautéed shrimp and fresh crab meat.
Season with salt and pepper as needed.
Sprinkle with fresh parsley and serve.
Alfredo sauce will continue to thicken as it cools.
Notes
Make sure you use heavy cream in this recipe vs whipping cream. Heavy cream has a higher fat content and will create a thicker sauce. Use freshly grated parmesan cheese for best results. Pre shredded parmesan cheese does not melt as smoothly as freshly shredded.