There are lots of these getting around at the moment.

It's just a matter of increasing in the round as you build the cone.

Make a final row of chains and sc to place the draw string into.

I made all of these in one evening.

I've added some cup cake purses

It's a better look for the base of the cup cake if it is done in fpdc and then a bpdc.

Below left, is a picture of a sc in the round cup cake base