In a bowl, beat the butter, sugar, and vanilla extract until smooth and creamy. Add the egg and mix until well combined.

Add the flour and mix gently with a spatula until a smooth dough forms. Be careful not to overmix.

Wrap the dough tightly in cling film, shape it into a rectangle, and freeze for at least 30 minutes. This makes it easier to roll and cut.

Roll the dough out on a lightly floured surface to about 1/4 inch thick. Use heart-shaped cookie cutters to cut out your cookies.

Place the cookies on a baking tray lined with parchment paper, leaving space between them.

Preheat the oven to 350°F (180°C) and bake the cookies for 7–8 minutes.

Let the cookies cool for a few minutes on the tray before transferring them to a wire rack.

Melt the chocolate, drizzle over the cookies, and add sprinkles while the chocolate is still soft.