Brunch staple
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">brunch staple</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for omelet that I've seen before include "Light meal" , "Egg dish" , "American food" .)