Mix sugar, oil, vanilla, and chocolate. Mix in eggs, one at a time. STir in flour, baking powder and salt. Cover and refrigerate at least 3 hours.
Heat oven to 350. Drop dough by teaspoonfuls into powdered sugar; roll around to coat. Shape into balls. Place about 2 inches apart on greased cookie sheet. Bake for 10 to 12 minutes, when almost no indentation remains when touched.