In A Medium Saucepan, Saute Onion In Butter Until Tender. Stir In Flour. Add The Potato, Water And Bouillon; Bring To A Boil. Reduce Heat; Cover And Simmer For 7-10 Minutes Or Until Potato Is Tender. Add Corn, Jalapeno, Milk And Seasonings. Cover And Simmer For 15 Minutes.