Golden syrup can be subbed for corn syrup. Flavor will be slightly effected.
Powdered milk can be omitted entirely. Flavor will be slightly effected.
Almond flour can be subbed 1:1 for cake flour. Almond flour gives a crumbly shortbread texture.
Cake flour can be subbed 1:1 for AP flour. Cake flour makes the crust light, crumbly, soft & tall.
AP flour may result in a denser, crunchy crust.
Nido Powdered Whole Milk (better flavor than non-fat powdered milk)
Lyle’s Golden Syrup