Mix together 1 cup of packed brown sugar, 2 teaspoons of lemon zest, 1 egg slightly beaten, 1 cup of flour, 1/4 teaspoon of baking powder, and 1/2 cup of melted butter that has been cooled to room temperature.
Mix well, then add sesame seeds and mix.
Drop by round teaspoons full on to baking sheets.
Bake at 375 degrees for 8-10 minutes until golden brown, don't over bake. Cool cookies on wire rack.
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