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Preheat the oven to 375 degrees F. Poke holes in each potato with a fork and then wrap them in foil. Bake each potato for an hour. Let cool until easy to handle. This step can be done the night before.
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Preheat oven to 375 degrees F. Add mushrooms, thyme, sage, olive oil, butter, salt, and pepper to a small baking sheet. Toss together and then evenly distribute the ingredients in one layer. Bake for 10-14 minutes until crispy.
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While the mushrooms roast, slice each potato in half. Scoop out the inside from each half of potato and add to a bowl along with the sour cream, milk, butter, and cheese. Mash all the ingredients together with a potato masher or blend together using an electric hand mixer until smooth.
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Place empty halves on a baking sheet. Add two or three big spoonfuls of the potato filling back to each potato half. Bake for 15-20 minutes until the tops are slightly golden.
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Top with mushrooms, parmesan, and crispy sage leaves. Another optional topping is balsamic syrup. Best the day of baking.