You could knit it the same except back and forth, adding the ear flaps as you go. Here's a pattern someone else was having trouble with - http://www.knitlist.com/95gift/ski.htm
which should be easy enough to change. Make the ear flaps, then CO half the back sts, plus one, knit one flap, CO the sts for the front, knit the other flap, then CO the other half of the back sts plus one. The 2 extra sts are for the seam and will be up the back of the hat.
Then knit in garter or ribbing for 6 rows, then in stockinette until length before decreases. Do the dec rows as written, though there will be one extra stitch at each end, purl the plain knit rows.