Thawing out your shrimp and remove the shells. I like to leave the tail on but you can remove that as well if you want.
Then place the raw shrimp in a large bowl and mix it with olive oil, freshly pressed garlic, salt, onion powder, oregano, black pepper, and cayenne (optional).
Cook the shrimp in a skillet, then remove
Now melt butter in a skillet over medium heat and cook the shrimp a few minutes on both sides until they are pink and opaque. 
Remove the shrimp and set them aside
Make the sauce and add shrimp and pasta back in
 turn the heat up to medium high and pour the cream inside the same skillet.
Once the cream comes to a simmer turn the heat off and add in the Parmesan cheese, cooked shrimp, and cooked pasta.
Notes
How to make it low carbIf you are looking for a low-carb alternative for this Cajun shrimp pasta, then try zucchini noodles, aka zoodles. You can buy them or just spiralize the zucchini yourself. They cook in a matter of minutes and have such a light flavor that they work really well with the seasonings in this cajun shrimp dish. Here is the recipe for the cajun shrimp alone.How long will it keep?In an airtight container, this cajun shrimp pasta will keep for 3-4 days in the refrigerator.