Shrimp & Crab Pasta with Creamy Cajun Sauce

1 red bell pepper
1 yellow bell pepper
1/2 white onion, chopped
1 rib celery
2 Tbsp butter
2 Tbsp Cajun seasoning, divided
3 cloves fresh garlic, chopped
3 tablespoon of flour
1 lb spaghetti pasta, cooked
Salt
1 C reserved pasta water
1 C heavy cream
2 cups of fresh grated parmesan
2 tsp black pepper
1 tsp garlic powder
1 lb jumbo shrimp, peeled & deveined

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