Brown the sliced sausage and diced onion in a skillet over medium-high heat.
Once the sausage is nicely browned, remove the sausage and onions from the skillet and set them aside.
Add tomato paste to the empty skillet and let it toast for a minute or two.
Pour in the pasta shells and chicken broth. Let the pasta cook until it is al dente.
Season the pasta with Cajun seasoning, onion powder, and garlic powder.
Add the heavy whipping cream and give it a good mix.
Add small handfuls of shredded Parmesan cheese, mixing continuously until all the cheese is completely melted.
Add the cooked sausage and onions back into the skillet. Toss everything one last time to combine, then serve.
Cook it hands-free.
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