Shortcut Knish

Ingredients

2 pounds russet potatoes

2 tablespoons unsalted butter

2 tablespoons extra-virgin olive oil

cups diced yellow onions

1 teaspoon salt

3 tablespoons sour cream

1 teaspoon salt

¼ teaspoon black pepper

1 large egg

1 sheet frozen puff pastry

1 large egg, lightly beaten

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