"Fresh blueberries and a lemon filling are sandwiched between a crumble crust and topping to make these delicious Lemon Blueberry Bars!..."
INGREDIENTS
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1 cup unsalted butter (2 sticks, softened)
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3 cups all-purpose flour
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1 1/2 cups old-fashioned rolled oats (not quick oats)
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1 1/3 cups light brown sugar (packed)
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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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14 oz sweetened condensed milk (1 can)
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1/2 cup fresh lemon juice
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2 teaspoons lemon zest (grated)
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2 1/2 cups blueberries (washed and drained, use at room temperature)