Preheat oven to 375°. Line a 13×9-inch baking pan with parchment paper, and spray with baking spray with flour.
For crumble: In the work bowl of a food processor, place flour, sugars, cornmeal, salt, cinnamon, and zest; pulse until combined. Add cold butter, and pulse until mixture is crumbly. Add egg yolks, pulsing until a loose dough forms. Stir in almonds. Firmly pat 4½ cups mixture into bottom of prepared pan. Reserve remaining crumble.
Bake until lightly browned, about 10 minutes.
For filling: In a medium bowl, stir together peaches, blueberries, sugar, cornstarch, and lemon juice. Pour over crust; top with reserved crumble.
Bake until golden brown, about 45 minutes. Let cool completely on a wire rack.
Recipe by Taste of the South at https://tasteofthesouthmagazine.com/blueberry-peach-crumble-bars/