Chewy, nutty, chocolatey — delicious! from Baking: From My Home to Yours For the oatmeal layer: 2½ cups all-purpose flour 1 teaspoon baking soda 1 teaspoon salt ½ teaspoon ground cinnamon 2 sticks (8 ounces) unsalted butter, at room temperature 2 cups (packed) brown sugar 2 large eggs 2 teaspoons pure vanilla extract 3 cups…