Preheat the oven to 175 degrees Celsius. Line two baking trays with baking parchment.
Whisk the flour, turmeric, baking soda, cinnamon, nutmeg, salt, and ginger together in a bowl.
Use a handheld beater to whip the butter, sugar, egg replacer (plus water), and vanilla extract in a separate bowl. Do this for 1-2 minutes.
Add the flour blend half at a time and beat just until the dough is uniform.
Scoop 1 tablespoon rounds of dough onto the prepared baking sheets, about 2 inches apart. Bake for 13-15 minutes, until cookies are firm around the edges.
Remove from oven and leave to cool on the sheet, if possible. If you have more dough and need to continue baking, you can shift some of the cookies to a wire rack to cool.