Heat oven to 375ºF. Roll out dough on lightly floured surface to 1/8-inch thickness. Remove lids from 6 clean (125-mL) jam jars. Use the ring from 1 jar to cut 12 (4-inch) rounds from dough, rerolling scraps as necessary. Press 1 round onto bottom and up side of each jar, extending edge of dough over top of jar.