Were I to make it again I would simplify the recipe. The flavor to effort ratio was low. I'd leave off the panko completely since I didn't think it added any taste. I'd add the garlic to the mushrooms, increase the mushrooms, and top that with the shredded parmesan and parsley. Loads easier and quicker. You could change out the heavy cream for milk but the result will be a little runnier. Perhaps a touch more flour could help that problem.
Sure looked tasty and made me try it.
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