Note in response to Laura: Great question! Yes, you can make it all ahead of time, just keep the the squash part and the breadcrumb mixture separate until you are ready to reheat the squash mixture and finish it. Otherwise the breadcrumbs get soggy.
Other notes: Using coarse breadcrumbs smashed up a little bit works a little better than the fine canned breadcrumbs you get at the grocery store. Also you can use all cheddar if gruyere or emmenthaler are too difficult or expensive... but I really like the flavor they give.
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