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In a bowl, beat butter and sugar. Add egg and almond extract.
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Mix in flour, baking powder, salt and 1 Tbsp of milk.
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Mix until well combined.
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Preheat the oven to 170 C / 338 F.
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Divide the dough into halves and form each to be 8 inches long.
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Cover full sheet cake pan with baking paper.
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Transfer the rolls to the pan, 5 inches apart.
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Using your fingers, flatten each roll to be 3 inches wide.
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Brush each flattened roll with milk and sprinkle with 1 ½ Tbsp almond slices each.
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Bake for 14 minutes.
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While still warm, cut crosswise on the diagonal into 13 strips each roll.
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Stir together icing sugar, almond extract and milk to get smooth texture.
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Drizzle over completely cool bars.