Can I consolidate these two jQuery on() events with a toggle()?

There has got to be a way to do these in one toggleClass():

$('div').on("mouseenter", ".myButton", function(){
         $(this).addClass('rollOver');
     });
 $('div').on("mouseleave", ".myButton", function(){
         $(this).removeClass('rollOver');
     }); 
 

...but it's within an on() because the myButton is created dynamically.

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