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Preheat the oven to 400 degrees F. Line a large baking sheet with a silpat or parchment paper.
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Make sure to add the frozen and thawed spinach to a paper towel or dish towel and squeeze the heck out of it to get any and all liquid out of it.
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Add the spinach, yogurt, feta, salt, pepper, and egg to a small mixing bowl. Mix well to combine.
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Lightly flour a work surface and a rolling pin. Unfold the pastry dough, remove the parchment, and roll out into a little bit of a wider and more even rectangle.
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Use a pizza cutter or knife to slice the dough in half horizontally. Then in half vertically. Then slice each half in half so you now have 8 small rectangles. Cut each rectangle in half on a diagonal to make a triangle. You should end up with 16 triangles. It should basically look like a can of store bought crescent roll dough when you are done cutting.
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Take about a teaspoon of the mixture and spread it over each triangle. Roll the wider end towards the smaller end to make a crescent. Place seam side down on the prepared baking pan. Continue until all 16 are prepped.
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Spread the melted butter over each unbaked crescent roll.
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Bake for 30 minutes until golden and crisp.