Blueberry Crumble Bars

Ingredients

• 3-4 cups blueberries (blueberry filling)
• 1/2 cups sugar (blueberry filling)
• 1 tablespoon cornstarch (blueberry filling)
• 1 tablespoon lemon juice (blueberry filling)
• 1 1/2 cups all-purpose flour (crust)
• 1 cup finely ground cornmeal (crust)
• 3/4 teaspoons salt (crust)
• 1 cup butter at room temperature (crust)
• 3/4 cups sugar (crust)
• 1 teaspoon vanilla (crust)