Spinach and Potato Knishes

Steps

1. Preheat oven to 400°F. Line a rimmed baking sheet with parchment. Transfer the thawed spinach to a colander and squeeze with your hands to remove any excess liquid. Transfer to a large bowl. Add the mashed potatoes and garlic, stirring to combine. Season with salt and pepper.
2. On a lightly floured surface, roll 1 puff pastry sheet to a 14x12-inch rectangle. Cut in half lengthwise. Leaving a 1-inch border, spoon ¼ of potato filling along the length of each piece of puff pastry. Shape filling into a log about 13 inches long. Brush the border with egg wash. Fold puff pastry over filling, pinching seams to seal. Arrange seam-side down on prepared baking sheet. Repeat with remaining puff pastry sheet and filling.
3. Brush tops of pastry with remaining egg wash. Bake 30–35 min., until pastry is golden brown. Let stand 10 min., then cut into 2-inch pieces on the diagonal.