01 -
Boil the penne in salted water till it's just tender (check the package for timing). Set aside some of the hot water for later, then drain the pasta and keep it warm.
02 -
Toss the shrimp in 1 Tbsp of cajun seasoning until coated. Heat 1 Tbsp olive oil in a deep pan over medium heat. Cook the shrimp on one side until pink, about 1-2 minutes, then flip and cook the other side for another minute or so. Take them out and cover tightly to stay warm.
03 -
Use the same skillet to melt the butter, then throw in the minced garlic and let it sizzle for 30 seconds. Toss the chopped tomatoes in and cook them for 2-3 minutes while stirring gently.
04 -
Pour in the heavy cream, stir in the leftover cajun seasoning, and add the grated parmesan. Wait for it to bubble, then turn the heat down and let it cook until the sauce thickens slightly, about 2-3 minutes.
05 -
Stir the cooked pasta and shrimp back into the pan, mixing well so everything is coated in the creamy sauce. If the sauce seems too thick, add a bit of the reserved pasta water to loosen it up. Sprinkle parsley and extra parmesan on top before serving if you like.