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1. Preheat oven to 350 degrees F. Line a 15x10x1-inch baking pan with foil, extending the foil over edges of pan; set aside.
2. In a large bowl, beat butter with an electric mixer on medium to high speed for 30 seconds. Add sugar, vanilla, and salt. Beat until light and fluffy, scraping sides of bowl occasionally. Beat in as much of the flour as you can with the mixer. Using a wooden spoon, stir in any remaining flour. Gather dough into a ball. Press dough evenly onto the bottom of the prepared pan.
3. Bake about 20 minutes or until light golden brown. Cool in pan on a wire rack.
4. Using the edges of the foil, gently lift shortbread out of pan. Using a serrated knife, cut shortbread crosswise into three 10x5-inch rectangles. Continue preparing each portion of shortbread as directed.