Well... there's a really simple way that is suitable if the ears need to be small.
Magic ring with 6 sc --> close --> FO
You'll get a really tiny semicircular ear. If you need it bigger, you can add more rows. Like this:
1) Magic ring with 6 sc, close magic ring, chain 1 + turn
2) 6 inc (12), chain 1 + turn
3) (sc, inc) x6 (18)
... and so on until the desired size
Note: though it starts with a magic round, they're actually work in rows, not in rounds.