Butter Tart Squares

Step 1

Line a 9x13" pan and line with parchment paper and spray with non stick spray. Preheat oven to 350 degrees F.

Step 2

In a large bowl, combine flour and powdered sugar.

Step 3

Cut butter into icing sugar and flour with a pastry cutter or your hands until pea-sized lumps of butter remain. When you grab a handful and squeeze, you want it to hold together. If it doesn't hold together, add 1-2 tablespoons of water.

Step 4

Dump flour mixture into pan and press down evenly to form a crust. Bake for 10 minutes.

Step 5

Meanwhile, prepare your filling. In a medium bowl, melt butter in the microwave.

Step 6

Whisk in brown sugar until smooth. Whisk in eggs, one at a time, then add the vinegar and vanilla. Stir in raisins if using.

Step 7

Pour over crust and bake another 25-30 minutes until filling is set or almost set -- a slight jiggle is fine but you don't want a lot of movement. Cool to room temperature and refrigerate several hours before slicing.