Fresh Peach Crumb Bars

These summery peach crumb bars have a juicy fruit filling layered between a buttery crust and sweet, crisp crumble topping - both are made from the same simple shortbread dough!

• 8 ounces butter, very soft
• 1 cup granulated sugar
• 2 teaspoons pure vanilla extract
• ½ teaspoon salt
• ½ teaspoon baking powder
• 1¾ cups all-purpose flour
• 1 cup almond flour, see notes
• ¾ cup cornstarch

• 5½-6 cups diced fresh peaches, ¼-inch dice; peeling is optional
• 2 teaspoons fresh lemon juice
• ⅓ cup granulated sugar
• 1½ tablespoons cornstarch
• ½ teaspoon ground cinnamon or cardamom

• 1 cup powdered sugar
• 1-2 tablespoons half & half
• ⅛ teaspoon almond extract