Get out your 9X9 (ideal) or 8X8 square pan and line with Parchment paper. (Just cut diagonally on the corners of the parchment paper to allow the corners to overlap inside the pan.). Spray the pan with cooking spray.
Combine the crust ingredients in a bowl and and stir till combined. Dump into your pan.
Use a small round flat bottomed object to firmly press the mixture into your pan. (i.e. a small glass or a measuring cup etc.)
Bake for 7 -9 minutes. Remove from the oven and set aside.
Cool the crust completely.
Make the Curd
Separate your egg yolks - setting aside the whites for another use.
Zest and squeeze your lemons. Note - more lemon juice is not better. Even if you don't want to waste the last bit of lemon...you only need 1/2 C lemon juice ! 🤣
Whisk all ingredients together in a bowl.
Pour mixed curd ingredients over the cooled crust.
Bake for 25 minutes.
Once the bars get a bit cool - put the entire pan into the fridge for at least 2 hours before slicing and preparing for presentation.
Notes
Consider making the crust in advance. It has to completely cool before adding the curd. The original recipe had a zest + sugar "candied lemon zest" on top which I made the first time - but will skip going forward - and hence it is not included here. This was my one key change to the recipe... I don't think it added anything to the bars besides calories. Remember the bars have to be in the fridge to set for at least 2 hours before you cut and serve them. So make the dessert in the morning or the night before your event. We cut the bars into a 5X5 == 25 servings. You do you, though, and cut them as large as you like !