CREATE TABLE table_19852975_3 (season__number INT, arties_disguises VARCHAR)

Name the season number for herr ostropolyer, pastry chef
SELECT MIN(season__number) FROM table_19852975_3 WHERE arties_disguises = "Herr Ostropolyer, pastry chef"
SELECT MIN("season__number") FROM "table_19852975_3" WHERE "Herr Ostropolyer, pastry chef" = "arties_disguises"