
Tammie, you and many other of my very young readers would have never heard this expression!!
"Holy Moly" originated as a well-known exclamation by the Captain Marvel Comic-Book characters created in 1939 by artist C. C. Beck and writer Bill Parker. Those characters (and the expression "Holy Moly") first appeared in Whiz Comics #2 (February 1940) and Fawcett Comics (1939–1953); for details see Captain Marvel (DC Comics).
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So...now, you know the rest of the story!! Spanish dish???? Girl, surely you jest!