For a foolproof filling that won’t break, no matter the brand of sweetened condensed milk, we add fresh dairy. Just ½ cup of cream bolsters the mixture with enough undamaged whey proteins to prevent the butter from separating out. Tap the link in our profile to sign up for a free trial and access our Millionaire’s Shortbread and hundreds more exhaustively-tested recipes. #cooksillustrated #millionairesshortbread #shortbread #twix #homemade #chocolate #caramel #holidaybaking #christmascookies #baking #bakingproject #weekendbaking #christmasbaking #cookiebaking