For the toffee melt butter. Add sugar, salt & vanilla and cook, stirring, until thick and bubbly. Pour onto parchment and let harden for ~15 min. Break into small pieces.
Mix everything together, spread onto a lined tray and bake at 165°C for 20 min until golden. Cool & break into pieces.
Brown the butter until golden & nutty. Let cool slightly, then whisk with both sugars. Add egg, egg yolk & vanilla.
Mix in the dry ingredients until just combined. Fold in cornflake crunch, sesame & chopped toffee.
Scoop into 12 balls, top with extra toffee & chill for at least 1½ hours.
Bake at 175°C for 9–10 min. While warm, shape with a large glass. Top with extra cornflake crunch & toffee.
Let cool for 10–15 min & devour!!
