Fresh Berry Cobbler Bars | A Cup Of Cream

Ingredients

• 3 cups blueberries, divided
• 2 ½ cups chopped strawberries
• 1 tablespoon lemon juice
• ½ cup sugar
• 2 tablespoons plus 1 teaspoon cornstarch
• 1 tablespoon butter
• 1 teaspoon vanilla extract
• 3 ¼ cup flour
• ¾ cup sugar
• ¼ packed brown sugar
• ½ teaspoon baking powder
• ½ teaspoon salt
• 1 teaspoon cornstarch
• 1 cup cold butter, cut into ½ tablespoon pieces
• 2 large egg yolks