Shelly's Recipe
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POTATO-MUSHROOM GRATIN
Category: Au Gratin and Scalloped
5 tbsp olive oil, divided
2 1/2 lbs medium Yukon Gold potatoes, peeled, cut lengthwise into 1/8-inch-thick slices
1 1/2 tsp coarse kosher salt plus additional for mushrooms
3/4 tsp freshly ground black pepper plus additional for mushrooms
1 1/4 cups (or more) heavy whipping cream, divided
1 cup freshly grated Parmesan cheese (about 3 oz), divided
2 tbsp chopped fresh thyme
6 garlic cloves, thinly sliced
12 oz fresh crimini (baby bella) mushrooms, sliced
Preheat oven to 375. Brush 13x9-inch glass or oval ceramic baking dish with 2 tbsp oil. Arrange 1/3 of potatoes, slightly overlapping, in dish. Sprinkle with 1/2 tsp coarse salt and 1/4 tsp pepper. Pour 1/3 cup cream over; sprinkle with 1/4 cup cheese. Repeat layering 1/3 of potatoes, 1/2 tsp salt, 1/4 tsp pepper, 1/3 cup cream, and 1/4 cup cheese 2 more times. Bake uncovered until potatoes are tender, adding cream by tbspfuls if dry, about 45 minutes. Remove from oven; maintain oven temperature.
Sprinkle thyme and garlic slices over gratin. Toss mushrooms in medium bowl with 3 tbsp oil; sprinkle with coarse salt and pepper. Arrange mushroom slices atop gratin around edge of dish. Drizzle with 1/4 cup cream; sprinkle with 1/4 cup cheese. Continue to bake uncovered until mushrooms are tender and potato edges are golden brown, about 20 minutes longer.
NOTE: Can be made 1 day ahead. Cool 1 hour in dish; cover and chill. Before serving, cut gratin into 10 pieces. Transfer to rimmed baking sheet. Cover with foil and rewarm at 350, for 10 to 15 minutes.
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