Preheat oven to 350 F (180C). Line a large baking sheet with parchment paper or a silicone baking mat and set aside. If you don’t have any of these, lightly grease the baking sheet with oil.
In a medium size bowl, add the flour, baking soda, cream of tartar, salt, and whisk together.
In a large bowl, using a hand-held or stand mixer fitted with a paddle attachment, cream the butter and sugar together on medium-high speed until fluffy and light. Add the egg, vanilla extract, condensed milk, golden syrup, or honey and beat on high speed until combined. Scrape down the sides and bottom of the bowl as needed.
Add the flour mixture to the creamed butter mixture and mix until combined. When using a stand mixer, mix the mixture on low speed until combined.
Follow the cookie press manufacturer’s directions to fit your cookie press with a decorative plate. Fill the cookie press with some of the cookie dough. Hold the cookie press perpendicular to the lined baking sheet and press the cookies 2 inches apart. If you use my design, add chocolate to the cookie’s center before baking. You can also use a small ice cream scoop to scoop the biscuit dough and roll the dough into round balls and flatten the top with a fork.
Bake the biscuit or cookies for 7-9 minutes or until the edges and bottom are lightly brown. When molding them into balls, bake them for 10 to 15 minutes or until slightly brown. Check the oven after 12 minutes since every oven is different.
Remove from the oven and cool on the baking sheet for about 5 minutes, then transfer to a wire rack to cool completely.
These cookies will stay fresh in an airtight container at room temperature for up to a week.