Preheat oven to 350F. Criss-cross line an 8x8" with parchment paper. Mix the crust ingredients together with a fork or pastry blender until it resembles coarse crumbs. Press into the prepared pan. Bake for 15 min. to 20 min. just until very lightly browned.

While the crust is baking, make the filling. Whisk together the eggs, egg yolks, sugar, lemon juice and salt in a medium pot over medium heat. Stir constantly for 10 min. The filling will thicken like pudding. Stir in the lemon zest and the butter. Remove from heat and continue to stir until butter is melted. Pour the filling over the crust and continue to bake for 15-20 min. or until the filling is set. Careful not to brown.

Let cool on a rack for about one hour, refrigerate for 2 hours or more. Using the parchment paper, lift the bars out and cut into 9 pieces. Serve with a dusting of icing (confectioner's) sugar and a lemon wedge (optional).