MIX butter, brown sugar and vanilla using a mixer. Gradually blend in flour and corn starch. Add chocolate chips. FORM into 1-inch balls; place on ungreased baking sheets. Pour sugar on a small plate; dip bottom of drinking glass in sugar and gently press down on each cookie to flatten. BAKE in a preheated 300°F oven for 25 to 30 minutes, or until bottoms begin to brown. COOL for 5 minutes; remove to a wire rack to cool completely. Lightly sprinkle additional sugar on top of warm cookies, if desired.
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