Whir first five ingredients in a food processor fitted with a metal blade until crumbly or sift dry ingredients and cut in cold butter with pastry cutter (photo 1 and photo 2)
Press into ungreased 9 x 13 pan
bake 20 minutes or until lightly golden brown, cool slightly about 5 minutes (photo 3)
in a separate bowl, mix remaining ingredients and pour over base (photo 4 and 5)
Bake 20 minutes until set but jiggly
Cool, cut into squares (photo 6)
Recipe by You Have Been Served at https://www.youhavebeenserved.ca/2015/12/05/butter-tart-squares-recipe/