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POTATO PORTOBELLO AU GRATIN

Shelly's
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Category: Au Gratin and Scalloped
    Prep Time:       Cook Time:       Total Time:  

5 or 6 Yukon gold potatoes, peeled
2 or 3 Portobello mushroom caps, sliced thin
1 cup grated hard cheese such as Parmesan or Asiago
3/4 cup half-and-half
Kosher salt and ground black pepper

Heat oven to 400 and butter a 13x9 inch baking dish and set aside. Using a mandolin, V-slicer or the slicing attachment on a food processor, slice the potatoes approximately 1/8 inches thick. Create the first layer by laying the slices in overlapping rows.

Once the first layer is down, season lightly with salt and pepper, then scatter with mushroom slices and a couple tbsp of the cheese. (Do not over-do it on these layers, if you create a barrier between the adjoining potato layers, the gratin will not set.) Continue building these layers, if you create a barrier between the adjoining potato layers, but be sure to save 1/2 cup of the cheese for the cheese for the top.

Pour 2/3 cup of the half and half over the gratin then spread both hands over the surface and push down to work the air out from the layers. Add remaining liquid only if half and half does not come to the surface when you push down. Sprinkle the gratin with cheese, cover loosely with foil and place in middle of oven for 1 hour. Check for doneness by inserting the point of a paring knife straight into the gratin. If it goes through smoothly, remove the foil, return to oven, and turn on the broiler just long enough to turn the top golden-brown. Remove, and allow to sit at room temperature for 15 to 20 minutes before serving.



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