Heat oven to 350°F.
Mix sugar, flour, and butter together in a bowl at medium speed until mixture resembles coarse crumbs.
Press crust mixture evenly onto bottom of greased 13×9-inch baking pan. Bake 18-22 minutes.
Mix all filling ingredients (except 1 1/2 cups pecans in bowl). Then stir in pecans.
Spread over partially baked crust.
Bake an additional 30-35 minutes.
Cool completely; refrigerate, cut into bars, and serve.