For best results, choose mushrooms that are around the same size. That way they will all cook in the same amount of time. For this reason, you may want to buy them loose, where you can hand-pick your mushrooms, rather than buying prepackaged.Make-Ahead Instructions: To prep this dish in advance, follow the steps of the recipe through filling your mushroom caps with the spinach mixture, then put the mushrooms in the refrigerator. Prepare the panko breadcrumb mixture as well, but wait to top th...
