Heat oven to 350°F. Grease and line an 8" x 8" metal baking pan with parchment paper; set aside.
In a medium bowl, whisk together flour, kosher salt, and baking powder. Set aside.
Create a double boiler by setting a large heatproof bowl over a pot of simmering water. (Don’t let the bottom of the bowl touch the water.)
Place white chocolate, butter, and tahini in double boiler. Gently melt while stirring occasionally. Once mixture is melted and smooth, remove from heat and allow to cool for 5 minutes.
Whisk brown sugar into white chocolate mixture. Then whisk in egg, egg yolks, and vanilla. Continue zealously whisking for a few minutes until mixture is smooth, thick, and glossy.
Add flour mixture, stirring with a silicone spatula just until combined. Gently fold in crumbled halva.
Using an offset spatula or the back of a spoon, spread your thiccc batter into prepared pan. Sprinkle sesame seeds and flaky sea salt on top.
Bake for 20–25 minutes until edges are set and golden brown but centre is still a wee bit jiggly.
Transfer pan to wire rack. Allow to cool completely.
Once blondies are totally cool, remove from pan by pulling up on parchment paper. Cut into 16 squares.
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