First, preheat the oven to 350 F / 176 C.  Get a 9x13 pan and line it, bottom, and sides with waxed paper or greased parchment paper.  This is important!

Make the crust by combining the crust ingredients in a food processor and processing until you have what looks a little like sand.  Take this and press it firmly into the prepared pan.

Combine the remaining ingredients into a bowl and mix them together.  I do not suggest using a stand mixer because it is just too powerful.  Use a regular bowl and whisk.

Bake the crust for about 20 minutes or until the sides start to brown.  Remove the crust from the oven and immediately pour the filling onto the hot crust.  Put this back in the oven and bake uncovered until the mixture has set, about 15 minutes.

Remove from the oven and let sit in the pan until cooled. Carefully lift the bars by using the sides of the paper onto a cutting board.  Cut into bars, sprinkle each with powdered sugar, and serve on a nice serving dish.