Preheat oven to 350°. Line 13x9-in. baking pan with foil, letting ends extend up sides of pan.

Place flour, confectioners sugar, cornstarch and salt in a food processor; pulse until blended. Add butter; pulse until butter is the size of peas. Divide mixture between prepared pans; press onto bottom of pans. Bake 10-12 minutes or until light brown. Cool on a wire rack.

For filling, melt butter in a large saucepan. Stir in brown sugar, corn syrup and salt; bring to a boil. Reduce heat to medium; cook and stir until sugar is completely dissolved, about 3 minutes. Remove from heat; stir in chocolate chips, cream and vanilla until smooth. Stir in pecans. Spread over crusts.

Bake 12-15 minutes or until filling is bubbly. Cool completely in pans on wire racks. Using foil, lift the shortbread out of pans. Gently peel off foil; cut each shortbread into 24 bars. Store in an airtight container.