Butterscotch Nut Slice

Ingredients

• Base
• butter, for greasing the pan
• 2 tablespoons superfine sugar
• 1/4 cup butter, cut into cubes and at room temperature
• 1 egg, whisked lightly
• 1 cup plain flour
• 2 tablespoons self-rising flour
• 1 pinch salt
• Topping
• 4 ounces macadamia nuts
• 4 ounces brazil nuts
• 1 cup dark brown sugar, firmly packed
• 3/4 cup butter, cut into cubes and at room temperature
• 1/4 cup heavy cream
• 2 tablespoons plain flour