Lemon Blueberry Streusel Bars

Ingredients (11)

• 1 cup (2 sticks) unsalted butter,
• 3 cups all purpose flour
• 1½ cups old fashioned rolled oats
• 1 1/3 cups packed light brown sugar
• 1 teaspoon salt
• 1 teaspoon baking powder
• 1 large egg
• 1 14-ounce can sweetened condensed milk
• 1/2 cup freshly squeezed lemon juice
• 2 teaspoons grated lemon zest
• 2½ cups room temperature blueberries,