Hi Marcia, did you use sourdough discard or ripe sourdough starter? You're likely to get a more vigorous rise with ripe starter, and that can help contribute to more nooks and crannies. Also, once you've shaped the English muffins you might want to error a little on the "young" side when it comes to the timing. If the English muffins aren't completely risen when you put them on the griddle, they may rise a bit more assertively. One last tip, separating the English muffins with a fork or English muffin splitter is likely to reveal more nooks and crannies than if you cut them with a knife. 

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