Question: Miranda Cosgrove made her debut through the single that was used as the theme song for the program on which network?
Sentence (from "Miranda Cosgrove discography"): American singer Miranda Cosgrove has released one studio album, two extended plays, two soundtracks, six singles, and three promotional singles. Cosgrove's debut as a recording artist began with the "iCarly" theme song "Leave It All to Me".
Relevant evidence: Yes