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2 tablespoons extra-virgin olive oil
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2 large shallots, finely sliced
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12 ounces brussels sprouts, trimmed and thinly sliced (about 4 cups)
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2 large garlic cloves, finely chopped
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1 teaspoon sea salt
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1 teaspoon black pepper, divided
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8 ounces fresh shiitake mushrooms, sliced
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4 tablespoon salted butter, divided
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10 large fresh sage leaves, finely chopped (about 2 tablespoons)
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5 large eggs
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3 cups whole milk
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1 package of Margot's Morsels San Francisco Sourdough Herb Stuffing mix (Or 1-1/2 packages of your favorite Margot's Morsel flavor
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4 ounces Gruyère cheese, shredded (about 1 1/4 cups)
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5 ounces Parmesan cheese, grated (about 1 1/2 cups)
Preheat oven to 350°F. Heat oil in a 12-inch cast-iron skillet over medium-high. Add shallots; cook, stirring occasionally, until shallots have softened, 1 to 2 minutes. Add brussels sprouts and garlic; season with 1/4 teaspoon pepper. Cook, stirring often, until sprouts have softened, about 5 minutes. Add mushrooms and 1 tablespoon butter. Cook, stirring often, until mushrooms are softened and slightly caramelized, about 4 minutes. Add sage, and cook 1 minute. Remove from heat, set aside in the skillet to let cool slightly, about 15 minutes.
Beat eggs and milk in a medium bowl; season with salt and remaining 3/4 teaspoon pepper. Melt 3 tablespoons butter and add to morsels. Combine morsel mixture, Gruyère, and Parmesan into brussels sprouts mixture in the skillet; gently toss to combine. Pour egg mixture over this mixture; let stand 45 minutes to allow bread to absorb egg mixture. (At this point, you can place it in the fridge for several hours or overnight. When you are ready to cook, let it come to room temperature before baking.
Bake in preheated 350°F oven until golden and center is set, 40 to 45 minutes. Serve hot or just warm.