Butter Tart Slice

Ingredients

Crust

8oz all purpose flour

28g powdered icing sugar

4oz unsalted butter cold, cubed

1-2 tablespoons cold water optional

Filling

• 2oz butter unsalted
• 10oz brown sugar lightly packed
• 2 large eggs
• 1 tbsp white vinegar
• 1 tbsp vanilla
• optional: 2oz raisins

Instructions

• Line a 9×13″ pan and line with parchment paper. Preheat oven to 350 degrees F/180 C.
• In a large bowl, combine flour and powdered sugar. 
• 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.
• Dump flour mixture into pan and press down evenly to form a crust. Bake for 10 minutes.
• Meanwhile, prepare your filling. In a medium bowl, melt butter in the microwave. 
• Whisk in brown sugar until smooth. Whisk in eggs, one at a time, then add the vinegar and vanilla. Stir in raisins if using.
• 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.