Cream butter and powdered sugar together in mixing bowl.
Mix in poppy seeds and lemon zest.
Gradually add in flour.
Gather into a ball and wrap in plastic. Refrigerate 15 minutes.
Roll out to 1/4-inch thickness.
Place on parchment paper-lined baking sheet.
Sprinkle with sugar and bake in 300°F oven for 20-25 minutes.
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