Preheat oven to 375°F/190°C/Fan 170°C and prep two to three baking sheets with parchment paper.
Mix all the ingredients in a bowl, no need for anything fancy, your hands will do great. If it's too dry and crumbly, add a bit more milk, if it's too sticky, let it rest 10 minutes on the counter or in the fridge, if it's still too sticky - add a little extra flour.
Using either parchment paper or a little flour, roll the dough out to about ⅛-¼ inch thick
Cut shapes using small cookie cutters and space on your baking sheets - these spread very little, you can get pretty daring. I think I put them about 1cm apart.
Bake for 12 minutes (assuming cookies are about ⅛" thick, longer if rolled thicker), rotating the cookie sheet half way through. They will be browning around edges and narrow bits (i.e. unicorn horns, animal feets, cat tails 😉)