Basil, Corn, and Shrimp Chowder

This is very easy and so, so delicious!  It's the perfect dish for a chili, snowy day.  Enjoy!
-2 Tbs salted butter
-1 small red onion, finely chopped
-1 green bell pepper, diced
-2 Tbs flour
-2 (8 oz each) bottles clam juice
-2 cups water
-2 tsp Old Bay seasoning
-1 tsp salt
-1 tsp dried basil
-24 oz large shrimp, peeled, deveined, with tails removed
-12 oz frozen corn
-2 Tbs capers, drained
-8 oz mascarpone cheese
Melt butter in large sauce pan.  Add the onion and pepper.  Cook for 5 minutes, stirring occasionally.  Sprinkle the flour and give it a good stir. Once veggies are evenly coated with the flour, add the clam juice, water, Old Bay, salt, and basil.  Mix well and bring to a boil.
Reduce heat and add the shrimp, corn, and capers.  Cook for about 5 minutes or until shrimp is nice and pink.
Remove pot from stove and stir in the mascarpone.  Stir until completely melted.  Ladle into bowls and enjoy!