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In a large bowl, mix the softened butter and brown sugar until well combined.
½ cup unsalted butter,1 cup light brown sugar
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Add the egg, and almond extract, and mix until smooth.
1 large egg,¼ teaspoon almond extract,2 teaspoon vanilla extract
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Add the flour, baking powder, salt, and almond flour and stir until just combined. Do not over-mix.
¼ teaspoon salt,1 & ⅓ cup all-purpose flour,¼ teaspoon baking powder,⅓ cup almond flour
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Spread the batter evenly into the prepared baking pan. top with the frangipane then swirl using a wooden skewer. Top with the sliced almonds
½ cup sliced almonds
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Bake for 30 minutes, or until the edges are set and the center is slightly firm.
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Allow the blondies to cool in the pan before dusting with powdered sugar, and slicing into squares.
Powdered sugar