For the biscuits:
For the icing:
Preheat the oven to 180°C. Prepare the muffin moulds by placing paper liners on the inside. Melt the butter. Using an electric whisk, beat the eggs and sugar until light and smooth. Gradually add the butter while whisking, then add the flour with the yeast by mixing gently. When the dough is smooth and uniform, fill the moulds halfway and bake them for 15 minutes. Wait until cool before removing them from moulds, then allow to cool on a rack. Prepare the icing. Mix the icing sugar and lemon juice gradually for a shiny and soft dough. Using a spoon or spatula, ice the cupcakes and sprinkle with sugar snowflakes. Let harden for a few minutes and then enjoy. The cupcakes can be kept for a few days in an airtight container.