Preheat oven to 350 degrees.
To make the cookie crust, blend 1 cup softened butter, 2 cups of flour and ¼ cup SPLENDA® Naturals Sugar & Stevia Sweetener Blend in a medium bowl.
Press the dough into the bottom of a greased 9x13 pan and bake for 20 minutes.
Assemble the lemon filling by mixing ¾ cup of SPLENDA® Naturals Sugar & Stevia Sweetener Blend, ¼ cup flour + 1 tablespoon flour, 4 eggs, fresh lemon juice and lemon zest.
When the cookie crust is done, let it cool and then pour the lemon filling on top of the crust. Bake for 20 minutes.
Once the bars are cooled, top them with a dusting of powdered sugar and slice into 24 bars.