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Process almonds in a food processor 9 minutes or until a paste forms, stopping to scrape down sides.
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Beat egg whites at medium speed with an electric mixer until stiff peaks form.
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Combine almond paste, sugar, cardamom and cinnamon in a bowl, mixing with hands until blended.
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Add egg whites; knead by hand until smooth and doughlike consistency.
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Wet fingers with water, and shape dough into 1-inch balls (about 1 tablespoon dough for each cookie).
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Slightly flatten with thumb.
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Place cookies on a parchment-lined baking sheet.
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Top each with almond sliver pressed in lightly.
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Bake on middle rack of oven at 325° for 15-20 minutes or until bottoms are lightly browned.
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Remove cookies immediately to wire racks; cool.