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Preheat oven to 350°F.
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Process almonds and confectioners' sugar in a food processor until ground to a fine powder.
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Transfer to a bowl.
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Put egg whites in the bowl of an electric mixer fitted with the whisk attachment, beat on medium-high speed until stiff peaks form.
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Fold egg whites into almond mixture; fold in almond extract.
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Transfer mixture to a pastry bag fitted with a 1/2 inch plain round tip.
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Pipe 20, 2 inch rings onto baking sheets lined with parchment paper, spacing about 1 inch apart.
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Bake cookies, rotating sheets halfway through, until golden brown and firm to the touch, about 25 minutes.
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Transfer cookies on parchment to wire racks; let cool completely.
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Cookies can be stored in an airtight container at room temperature up to 2 days.