"These Lemon Blueberry Streusel Bars are a delicious dessert treat to make in the summertime when you have access to wonderful, fresh blueberries...."
INGREDIENTS
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1 cup (2 sticks) unsalted butter, (at room temperature)
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3 cups all purpose flour
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1 1/2 cups old fashioned rolled oats ((don't use quick cook oats))
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1 1/3 cups packed light brown sugar
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1 teaspoon salt
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1 teaspoon baking powder
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1 large egg ((separated))
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1 14-ounce can sweetened condensed milk
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1/2 cup freshly squeezed lemon juice
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2 teaspoons grated lemon zest
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2 1/2 cups room temperature blueberries, (washed and dried on paper towels)