Heat a saute pan on medium high, add in 1 Tbs oil and the shrimp. Season with Cajun seasoning and salt and pepper. Cook 2-3 minutes.
Add in the onion, asparagus and bell pepper, cook 2-4 minutes. Adjust seasoning and turn heat off once asparagus turn bright green and shrimp are cooked through.
Heat water with garlic powder, onion powder, salt and pepper. Bring to a boil and whisk in grits. Cook 5 minutes while whisking every so often, add in the parmesan.
Adjust seasoning, serve with shrimp and vegetables on top. Garnish with parsley.