Heat oven to 425°F. Remove crust from pouch; unroll on work surface. Using large round cookie cutter, cut out rounds. Gather up any scraps; reroll with rolling pin and cut out more rounds to make a total of 10. Press each crust round into ungreased regular-size muffin cup.
In medium bowl, stir together apples, sugar, flour, cinnamon and vanilla. Divide mixture evenly among crust-lined muffin cups.
Bake 18 to 20 minutes or until crusts are golden brown and mixture is bubbly. Cool completely in pan, about 30 minutes. With knife, loosen edges; remove mini pies from muffin cups.