Beat cream cheese, 3/4 cups of the butter, the granulated sugar and 2 tsp of the vanilla in a large brown with electric mixer on medium speed until well blended. Add flour and baking soda; mix well. Cover. Refrigerate for 30 minutes.
Preheat oven to 350ºF. Press dough firmly onto bottom of an ungreased 15x10x1 inch baking pan. Bake 15 minutes or until lightly browned. Meanwhile melt remaining 1/4 cup butter; place in medium bowl. Add eggs, brown sugar corn syrup and remaining 1 teaspoon of vanilla. Mix until well blended. Stir in pecans.
Spread pecan mixture evenly onto warm crust. Bake an additional 25-30 minutes or until topping is firm around the edges and slightly soft in the center. Cool completely on wire rack. Cut into 60 bars to serve.