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1. Preheat the oven to 400°F and line a baking sheet with parchment paper.
1 sheet puff pastry sheet
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2. Finely dice the cooked potatoes so the pieces are small and even.
1.5 cup cooked potatoes
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3. Thinly slice the scallions, keeping white and green parts together.
4 piece scallions
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4. Melt the unsalted butter in a skillet over medium heat, add the diced potatoes, salt, black pepper, and garlic powder, and sauté until warmed through and lightly crisp at the edges, then remove from the heat.
1.5 cup cooked potatoes,
1 tbsp unsalted butter,
0.5 tsp salt,
0.2 tsp black pepper,
0.2 tsp garlic powder
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5. Stir the sliced scallions and grated cheddar cheese into the warm potatoes until evenly combined and the cheese just starts to soften.
1.5 cup cooked potatoes,
1 cup cheddar cheese,
4 piece scallions
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6. On a lightly floured surface, roll the puff pastry sheet into a rectangle about 0.25 inch thick, then cut it into 12 equal squares.
1 sheet puff pastry sheet
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7. Place the pastry squares on the prepared baking sheet and spoon a small mound of potato filling into the center of each square.
1 sheet puff pastry sheet,
1.5 cup cooked potatoes,
1 cup cheddar cheese,
4 piece scallions
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8. Fold each pastry square up around the filling to form a little bundle, pinching the seams at the top to seal well so the cheese stays inside.
1 sheet puff pastry sheet,
1.5 cup cooked potatoes,
1 cup cheddar cheese,
4 piece scallions
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9. Beat the egg with the milk in a small bowl to make an egg wash, then brush it over the tops and sides of the pastry bundles.
1 sheet puff pastry sheet,
1 piece egg,
1 tbsp milk
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10. Bake the puff pastry bites for 15 to 18 minutes, or until deeply golden, puffed, and the filling is hot and melty inside.
1 sheet puff pastry sheet,
1.5 cup cooked potatoes,
1 cup cheddar cheese,
4 piece scallions
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11. Let the bites cool for a few minutes on the baking sheet before serving warm.