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1
To make the basic butter crust, add the flour, salt and baking powder to the bowl of a food processor. Pulse to combine. Add the butter and pulse until it forms a sandy crumb. Starting with 4 tablespoons, sprinkle the water over the flour-butter mixture and pulse until it forms a ball, about 45 seconds to 1 minute. Add another tablespoon or two of water if necessary. Dump onto an unfloured counter and form into a flat disc. Wrap in plastic or waxed paper and let chill until firm, but still pliable, about 1 hour (you can also quick chill it in the freezer for 20 minutes while you prep your filling ingredients).
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2
Preheat oven to 400u00b0F. Line two 11-inch by 16-inch rimmed sheet pans with parchment paper.
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3
In a medium bowl, mix the vegetables and ricotta cheese together. Season with salt and pepper, if necessary.
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4
On a lightly floured surface, roll the dough out to 1/8 to 1/16-inch thick. Cut out 5-inch circles. It's okay to re-roll the scraps until all the dough is used up. Place cut circles on the prepared baking sheets (do not forget to place on parchment before forming pockets or they will be too delicate to transfer). Spoon 1 to 1 1/2 teaspoons of filling into the center of each circle, fold over, making sure the filling is not spilling out the edges, and crimp the edges with a fork. Pierce tops with the tines of a fork to create steam vents.
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5
Brush tops with egg wash, if using. Bake for 15 minutes, until golden. Let sit on sheets for 2 minutes, then transfer to a wire cooling rack. Serve warm. May be stored, wrapped in the refrigerator for up to 3 days. No doubt, they can also be stored in an air-tight zip-top bag in the freezer, though I don't know for how long since they get eaten too fast around here.
