Sugar cookie ingredients:
Flour, butter, eggs, sugar, vanilla extract, lemon emulsion, baking powder.
Royal icing ingredients:
Sugar, meringue powder (corn starch, egg whites, sugar, gum arabic, calcium sulfate, citric acid, cream of tartar, artificial flavours, silicone dioxide), water, gel food colouring, corn syrup.
Other decorations:
Sprinkles, edible airbrush colours, edible marker, decorative sugar
For cookies sold by the dozen (i.e. Matcha and Red Velvet), the ingredients are outlined on the product listing.