Cream the butter with the vanilla, zest, and sugar. Add the egg and beat until combined.

Then, using your fingers and without kneading, incorporate the flour until a dough forms.

Roll out the dough with the help of parchment paper, preferably on a silicone mat or another sheet of paper, and cut into the desired shapes. Bake in a moderate oven at 350°F (180°C) until they are slightly golden underneath, and if you like, you can let the edges brown slightly.

For the icing: Sift the sugar to avoid lumps.

Beat the egg whites to stiff peaks with an electric mixer, meaning that when you turn the bowl upside down, the whites do not fall. Then gradually add the sugar until it is no longer shiny and is firm. To test the consistency, when you lift the mixture with the beater, a firm peak should form, and the tip should bend slightly.

Icing for filling: It should be more liquid. Dilute the icing with a little water until when you make a line in the bowl and move it with your hands, the line disappears.

Place the icing in a piping bag with the desired tip and decorate the cookies.

Mummy cookie: Use a round cutter. Attach the eyes with icing and use a No. 47 tip and firm icing on the smooth side to make lines for the "mummy" effect.

Pumpkin cookie: With the pumpkin cutter and a No. 3 or 5 tip with filling icing, outline and fill everything with orange. You can use a toothpick to distribute it well. Then, with the icing already dry (ideally let it sit for 1 hour), make the segment details with a No. 1 tip and firm but slightly less thick icing. Then attach eyes and draw the mouth with a No. 1 tip in black.

You can also make the segments on the edges, let them dry, and make the center ones to achieve a 3D effect.

Catrina cookie: I used an upside-down snowman mold. Fill the cookie with fluid white icing and a No. 3 or 5 tip. Let it dry well; it's important so the colors don't mix. Then, with a No. 1 tip and firm but slightly less thick icing, make the details of the eyes, mouth, and nose. With a No. 13 tip and firm icing, make the flowers, creating a spiral from the inside out.

Spider web cookie: Fill the cookie with fluid white icing using a No. 3 or 5 tip. Then make some circles with fluid icing but a bit thicker than the white, in black. Use a toothpick to make lines from the center outward to achieve the spider web effect. Add 2 M&Ms to simulate the spider and draw the legs with icing or an edible marker.

Lastly, a general tip for making your lines. Support your piping tip and then make the stroke "in the air," so your lines will look straighter. If you have any questions, write to me :) I hope you like them!!