"Make Ahead: Prepare this recipe through Step 4, and freeze. Thaw potato mixture in the fridge at least 24 hours before you plan to serve, and let it stand 20 minutes before baking as directed...."
INGREDIENTS
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1/2 cup butter, softened and divided
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6 cups shredded kale, chard, cabbage, or other leafy greens
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1/2 cup thinly sliced green onions, white and light green parts only
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1/4 cup reduced-sodium chicken broth
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Kosher salt and freshly ground black pepper to taste
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4 pounds small russet or Yukon gold potatoes, peeled and cut into 2-inch pieces
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1 tablespoon kosher salt
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4 ounces cream cheese, softened
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1 cup milk