→ Base
01 -
Unsalted butter, room temperature - 1 cup
02 -
Light brown sugar - 1 cup
03 -
Large egg yolk - 1
04 -
Vanilla extract - 1½ teaspoons
05 -
Salt - ½ teaspoon
06 -
All-purpose flour - 2¼ cups
→ Topping
07 -
Milk chocolate chips - 2 cups
08 -
English toffee bits (Heath brand) - ½ cup