Preheat the oven to 350°F (175°C). Line baking sheets with parchment paper.

In a large bowl, cream together the softened butter and sugar until light and fluffy.

Add the egg and vanilla extract to the mixture and beat until combined.

Gradually add the flour, mixing until just incorporated.

Roll the dough into 1-inch balls and place on the prepared baking sheets.

Bake for 12-15 minutes or until the edges are golden brown.

Allow cookies to cool on wire racks before serving.