From Weight Watchers
1 c all-purpose flour
1 Tbsp powdered sugar
1/2 tsp salt
3 Tbsp canola oil
1 Tbsp cold, unsalted butter, cut into pieces
1 tsp apple cider vinegar
4 Tbsp ice water
In a food processor, "pulse" the flour, sugar, and salt. Add the oil and butter, and continue to "pulse" until the mixture resembles coarse crumbs.
Combine the water and vinegar in a separate bowl, and pour through the food processor feed tube while continuing to pulse the mixture, just until dough forms.
Shape the dough into a disk, wrap in plastic wrap, and refrigerate until chilled (at least 30 minutes, or up to 24 hrs).