In food processor, combine flour, sugar and salt. Pulse several times to mix. Add butter and pulse until butter is broken up and incorporated with the flour to form a crumbly mixture. In small bowl, combine egg yolks, milk and vanilla. Add 1/4 cup chopped sun-dried tomatoes and 1 tablespoon shredded Parmesan cheese into egg mixture. Add to flour mixture. Pulse until dough comes together.