Mix oil,chocolate and sugar. Add one egg at a time until well mixed. Add vanilla, salt,flour and baking powder. Chill overnight, or for several hours. Heat oven to 350 degrees. shape dough into balls of about one teaspoon each and roll in powdered sugar. Place dough balls approximately 2 inches apart on a well greased backing sheet. Bake 10 to 12 minutes. Makes about 50 cookies.