INGREDIENTS
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1 tablespoon olive oil, plus more for the baking dish
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8 ounces sliced white or brown mushrooms
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2 cups shredded carrots
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5 ounces baby spinach (about 5 packed cups)
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2 cups frozen diced potatoes (do not thaw)
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1 cup roasted red pepper strips
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2 cups shredded sharp cheddar cheese
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12 large eggs
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2 cups half-and-half
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2 teaspoons kosher salt
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1/4 teaspoon freshly ground black pepper