"While [casting gummy bears into the fire], chant the following: 'Sed quid agam nescio canere volo infigo.'"
Which, in Google Latin, translate to "I have no idea what I'm doing but I want to sound impressive."
(I know people on here who could make it correct Latin, but I deliberately want to use bad Google Translate Latin because that's basically what the ancient Greeks were doing with nonsense words in their spells)
Edit: I'm amending it to "Nescio quid agam, sed volo canere infigo. Novem ursi et a anatis ex gelatinum. Non est vegan." --> "I don't know what I'm doing, but I want to sound impressive. Nine bears and a duck [made] from gelatin. That is not vegan."