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In a large bowl, cream butter and sugar for two minutes or until fluffy. Beat in egg, milk, lemon juice, zest and extract.
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In separate bowl, stir together flour, baking soda and salt. Gradually add to butter mixture and mix well.
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Stir in poppy seeds.
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Shape into two logs that are 8 inches long. Wrap separately in plastic wrap. Refrigerate or freeze until firm. (Approximately three hours in the refrigerator.)
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Preheat oven to 350°.
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Unwrap dough and cut into 1/3-in. slices. Place 2 in. apart on baking sheets line with parchment paper or silicone baking sheets. (Ungreased will work too.)
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Bake 8-12 minutes or until edges are golden. (If you want a chewier cookie, use the lower end of that baking time and remove before edges are golden.)
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Cool a minute before removing to wire racks. Cool completely.