Healthy Peach Cobbler

Name: Healthy Peach Cobbler
Ingredients: 1 ¼ pounds fresh peaches (3-4 large), peeled, if desired, and thinly sliced, or 4 cups sliced frozen peaches, thawed; ¼ cup sugar; 1 tablespoon cornstarch; ¼ teaspoon freshly grated lemon zest; 1 tablespoon lemon juice; Pinch of salt; 1 cup white whole-wheat flour; ½ cup cornmeal; 1 ½ teaspoons baking powder; ¼ teaspoon baking soda; ¼ teaspoon salt; 1 large egg; ½ cup buttermilk; ¼ cup canola oil; 3 tablespoons sugar, divided; ½ teaspoon ground cinnamon