Preheat the oven to 350°.
Beat your butter and sugar together for 2 minutes. Scrape the sides of the bowl and mix for another 1 minute.
Add in the egg and the vanilla, and mix until combined.
Add baking soda and flour. Add the flour 1 cup at a time to avoid a large mess with the mixer.
Add in water. You want a play dough-like consistency. If the dough seems dry, or it won’t stick to each other (you may see the dough turn into little balls), try adding water ½ tbsp at a time to get it to stick better. If the dough is wet to the touch, try adding a bit more flour.
Lay out your parchment paper or silicone mat. Roll out your dough to about ¼ inch thick. Cutting your cookies on your baking surface means you do not have to transfer the cookies (keeping their shape in tact)!
Cut the dough with your cookie cutters, or use an upside down glass to get a basic circle shape. Remove excess dough from the cookie sheet.
Bake for 7-9 minutes. The cookies will be soft, but not doughy to the touch. Check them at 7 minutes - do not let them brown or they will lose their soft texture!
Let the sugar cookies sit for 1 minute on the pan before transferring them to a cooling rack. Cool completely before frosting.