INGREDIENTS
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3/4 cup/170 g butter, plus more for pan
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1 cup/225 g brown sugar
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1 1/2 cups/200 g ground almonds
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1 cup/110 g rolled oats, toasted
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4 cups blueberries
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1/4 cup/55 g granulated sugar
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2 tablespoons flour
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Slightly sweetened vanilla-flavored whipped cream, for serving, optional