、？
Um, did I have bread crumbs?
Literal
Um, bread-crumbs [topic-は] existed [question-かな]?
パン粉 'bread crumbs' (パン 'bread' + 粉 'powder/crumbs') is the standard culinary term for panko. 有ったかな uses the past tense + かな (wondering particle) — 'I wonder if I had them / did I have them?' えーと is the thinking-aloud filler. A natural, internal-monologue kitchen moment.