Preheat oven to 350º F.
In a medium bowl, beat butter with a mixer on medium to high speed for 30 seconds. Add the ¼ cup of sugar; beat until combined.
Beat in the 1 cup of gfJules™ flour until crumbly, being careful not to over-mix. Press mixture into the bottom of an un-oiled or parchment-lined 8x8x2 baking pan.
Bake for 15 minutes or until golden.
Combine eggs, sugar, flour, lemon zest, lemon juice, and baking powder; beat 2 minutes or until thoroughly combined.
Pour filling over baked crust. Bake 20 minutes more or until set and lightly browned.
Cool on a wire rack. Cut into bars only when completely cool. Sprinkle with powdered sugar, if desired, before serving.
