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In electric mixer, cream butter, brown sugar and sugar until light, then beat in egg yolk and lemon extract.
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Measure flour, cinnamon, salt and baking powder into a small bowl and stir to mix, then mix into the butter mixture.
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Stir in almonds until well mixed and crumbly.
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Grease an 8 inch square baking dish with butter, then pat half of the dough into bottom of dish.
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Measure preserves into a small dish and stir until it is of an easy spreading consistency; dump onto middle of dough in pan and spread as evenly as possible to 1/4 inch of sides of pan.
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Crumble remaining dough evenly over top, all the way to sides, then press lightly.
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Bake for about 30 minutes in a preheated 350 degree (Fahrenheit) oven.
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Remove from oven and cool completely if you can wait that long, then cut into sixteen squares.