These traditional yet lesser-known Czech Christmas cookies, called "Křehulky," are renowned for their incredible delicacy and crispness. To make these cookies, you need only two basic ingredients: eggs and sugar.
Begin by preparing the molds. Grease them thoroughly, preferably with solid fat rather than liquid oil.
Place 2 egg yolks and 1 whole egg, including the white, into a large mixing bowl. Add 1 ½ cups powdered sugar. Add ½ teaspoon vanilla paste and ½ teaspoon lemon juice.
Using a hand mixer, beat the mixture until it becomes fluffy and creamy. Be patient, as this process takes about 15 minutes.
Pour the mixture into the prepared molds, filling them about ⅔ full. Avoid filling them to the brim, as the cookies will puff up during baking.
Preheat the oven to 300 °F and place the baking sheet with the filled molds inside. The cookies will rise in 5–10 minutes. Once they do, reduce the oven temperature to 220 °F and bake for an additional 30 minutes.
Towards the end of the baking time, remove one mold and let it cool for a bit. Carefully remove the cookie from the mold, cut it in half, and check if it is fully baked inside, ensuring there are no wet parts.
If the cookie is dry and crispy, remove the baking sheet with the remaining pieces from the oven and let them cool for a bit.
Carefully remove the cookies from the molds by gently twisting the top of each cookie sticking out of the mold to release it. There should not be a need to tap the mold on the table.
Notes
The basic recipe makes about 20-25 cookies.
STORAGE: To keep these hollow cookies crisp for as long as possible, it is recommended to store them well-sealed in an airtight container. A metal or plastic cookie box lined with foil is ideal.
EQUIPMENT: For these crispy hollow cookies, I used metal molds with a diameter of 2–2.½ inches. You will need about 20-30 pieces.
Can I freeze the cookies?I don't recommend freezing these cookies because they lose their crisp texture when thawed and may collapse due to moisture.