Simple past tense and past participle of crumb.(verb)
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Use "crumbed" in a sentence
"Pass the eggs through the flour, shaking off any excess, then the beaten egg and finally the breadcrumbs, re-moulding them once crumbed."
"Sides are worth making space for: creamed sweet corn with chilli and basil or Brussels sprouts with a crust of crumbed prosciutto and hazelnuts."
"The buttermilk cake - that I opted to bake in a 9 springform and slice into layers rather than bake separately - was divinely tender and fine-crumbed, but held up to a light soaking in it's namesake liqueur overnight."