Line 2 baking sheets with parchment paper or greased and floured foil.
Using 8" cake pan as guide draw two circles on each paper; set aside.
In food processor, process 1-1/2 cups of the pecans, 1/2 cup of the sugar and cornstarch until finely ground.
In bowl and using electric mixer, beat egg whites until soft peaks form.
Gradually beat in remaining sugar until stiff glossy peaks form.
Add vanilla. Sprinkle with 1/2 the nut mixture; using rubber spatula, fold into egg whites.
Repeat with remaining nut mixture.
Divide meringue mixture among circles on baking sheets; spread evenly to fill circles.
Bake in 275 degree oven for 60-75 minutes or until tops are firm to the touch, switching baking sheets between top and bottom racks midway through baking.
Using sharp knife and same cake pan as guide, trim meringues in even circles while still hot.
Slide long metal spatula under meringues to loosen; carefully transfer to rack and let cool completely.
Meringues can be stored in airtight container for up to 1 week.