Lemon Blueberry Sour Cream Crumb Bars Recipe

Ingredients

• 1/2 cup unsalted butter (melted and cooled slightly)
• 1/2 cup brown sugar
• 1 1/2 cup all-purpose flour
• 1/2 teaspoon baking soda
• 1/2 teaspoon baking powder
• 1/4 teaspoon salt
• 1 - 1 1/2 cups fresh blueberries
• 1/2 cup granulated sugar
• 1 1/2 teaspoons cornstarch
• 3/4 tablespoon fresh lemon juice
• 1/2 cup sour cream
• 1/4 cup granulated sugar
• 1 tablespoon all-purpose flour
• 1 egg
• 1/2 teaspoon vanilla