Line an 8 x 8 baking dish with foil or parchment paper that hangs over the edge so it is easy to take out of the pan.
Preheat the oven to 350 degrees.
To make the crust combine all the crust ingredients in a food processor and pulse several times. Then process on high for 1 minute or until the mixture begins to come together.
Press the mixture into the bottom of the prepared pan and bake in the oven for 20 minutes.
Meanwhile, prepare the lemon filling. Beat the eggs in a large bowl. Whisk in the sugar, flour, and lemon juice and mix until smooth.
Pour the lemon mixture over top of the crust and bake in the oven for 30 minutes or until the filling is set and the edges begin turning golden.
Remove from oven and cool completely on a wire rack.
Use the foil or parchment to remove the bars from the pan. Dust with powdered sugar if desired and cut into 16 bars.
Store bars in the refrigerator for up to 5 days.