My son Massimo loves anything made with spinach. These are a blast to make with kids and freeze really well.
1 10-oz package frozen chopped spinach, thawed
3/4 cup crumbled feta
3 tbsp Pecorino Romano cheese
1/4 cup very finely minced onion
1 tbsp olive oil
1 tsp chopped dill
1 tsp minced garlic
1/2 tsp Kosher salt
freshly ground black pepper to taste
2 large eggs
1 sheet frozen puff pastry (from a 17.3-ounce package), thawed, rolled out to a 12-inch square, kept chilled
Using your hands, squeeze spinach until dry, forcing out as much water as possible (too much water will make for a soggy filling; you should have about 2/3 cup well-drained spinach). Mix spinach and next six ingredients in a medium bowl. Season to taste with salt and pepper. In a small bowl, beat 1 egg to blend; fold into spinach mixture.
Cut puff pastry into 3 equal strips. Reserve 1 strip for another use. Cut each remaining strip into 3 squares for a total of 6. Place a square in each muffin cup, pressing into bottom and up sides and leaving corners pointing up. Divide filling among cups. Fold pastry over filling, pressing corners together to meet in center. DO AHEAD Spinach puffs can be assembled 3 hours ahead. Cover puffs and chill.
Preheat oven to 400°. Beat remaining egg to blend in a small bowl. Brush pastry with egg wash (this will give the pastry a nice sheen). Bake until pastry is golden brown and puffed, about 25 minutes. Transfer to a wire rack; let puffs cool in pan for 10 minutes. Run a sharp paring knife around pan edges to loosen; turn out puffs onto rack to cool slightly before serving.
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