Place the all-purpose flour, softened butter pieces, heavy cream, and egg yolk in a large mixing bowl.
Using a fork, begin incorporating the egg yolk and cream into the flour mixture.
Continue combining the ingredients with your fingertips until the mixture develops a crumbly consistency.
Turn the mixture onto a clean work surface and knead it briefly, just until it comes together as a soft, smooth dough. If it feels excessively sticky, lightly dust the dough with a small amount of flour as you knead.
Stop kneading as soon as the dough becomes cohesive. Form it into a cylinder, then cover it securely with plastic wrap.
Refrigerate the wrapped dough for 1 1/2 hours. Chilling allows the butter within the dough to become firm again, helping prevent sticking when the dough is later rolled and reducing the need for additional flour.
Once the chilled dough is semi-firm, place it on a work surface and roll it to approximately 1/8 inch (0.3 mm) thick.
Cut the dough into assorted shapes with cookie cutters. Smaller cutters are preferable when possible, as they can promote more consistent results.
Arrange the shaped cookies on a parchment-lined baking sheet. A thin pastry scraper may be used to lift and transfer the delicate cutouts while preserving their shape.
Preheat the oven to 360°F (182°C).
Bake the cookies for approximately 10–12 minutes, watching them closely and removing them once they develop a light golden color.
Avoid baking them for too long, since excessive baking can produce cookies with an overly firm texture.
Transfer the freshly baked cookies to a wire cooling rack and allow them to rest for approximately 5 minutes.
While they remain warm, generously coat each cookie with the confectioners’ sugar, creating a sweet coating and a classic snowy holiday finish.