This is a Snap Pea Sheep recipe!
Typically the spinach is blanched before adding to a recipe because of the juice that is released from the green. In this case, the juice keeps the mushrooms moist.
A nice variation of this dish is to add artichoke hearts on top the spinach before the panko.
A vinegar based hot sauce can be sprinkled on these to lend a little heat. You can make your own by blended a 1/2 tsp of cayenne pepper with 2 tbsp vinegar or white wine.
I mixed the parsley with the spinach but you could sprinkle fresh chopped parsley over the baked mushroom before serving.
Sometimes panko will not brown without added oil. If you feel your mushroom is done and getting dry, spray with a little water and put them under the broiler for 3-4 minutes to brown the panko.
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Portobello Mushrooms Rockefeller https://snappeasheep.com/portobello-mushrooms-rockefeller/