Heat oil in medium saucepan.
Add celery, onion, and green pepper, and saute for 2 minutes.
Add corn, potatoes, water, salt, pepper, and paprika.
Bring to boil, then reduce heat to medium.
Cook covered for about 10 minutes or until potatoes are tender.
Place 1/2 cup of milk in jar with tight fitting lid.
Add flour and shake vigorously.
Gradually add milk-flour mixture to cooked vegetables.
Then add remaining milk.
Cook, stirring constantly, until mixture comes to boil and thickens.
Serve garnished with chopped, fresh parsley.