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It works if you K2, cast off 10, slip the last stitch from the cast off (which is sitting on the right needle) to the left needle, cast on 11, slip the last st cast on stitch to the right needle, slip next stitch on right need over new stitch. At this point there are 2sts on the right needle and 13sts on the left needle. K13. The next row is purl across all sts.
You should be able to do the same thing again when you get to the second earhole. It's like making very large buttonholes on the front band of a sweater. They'll line up one over the other.