Cook fettuccine noodles according to package directions. Drain (), toss with a bit of olive oil, and set aside.
In a large skillet melt 1 tablespoon butter. Stir in 1 teaspoon olive oil.
Add shrimp to the skillet and sprinkle Cajun seasoning all over the shrimp, then stir for 4-7 minutes until shrimp is opaque.
Use tongs or a slotted spoon to transfer shrimp to a dish and cover to keep warm.
Without cleaning out the skillet, melt butter over medium heat. Stir in garlic for 1 minute til fragrant.
Stir in flour for 1 minute. Gradually whisk in milk, then reserved pasta water.
Add parmesan cheese and salt and stir until parmesan is dissolved. Taste, add salt and pepper if needed.
Add cooked fettuccine noodles to the skillet and return shrimp to the skillet. Give it a good toss.
Garnish with chopped parsley and additional grated parmesan if desired, and serve.
