01 -
Heat the oven to 350°F (175°C). Lightly grease an 8-inch square baking pan.
02 -
In a large bowl, whisk together the flour, sugar, baking soda, cinnamon, and salt until evenly combined.
03 -
Add the water, oil, vinegar, and vanilla. Stir just until the batter is smooth and no dry flour remains. Do not overmix.
04 -
Pour the batter into the prepared pan and spread it evenly into the corners.
05 -
Mix the 2 tablespoons sugar with 1 teaspoon cinnamon. Sprinkle evenly over the batter.
06 -
Bake for 30-35 minutes, until the center springs back lightly and a toothpick inserted in the middle comes out with moist crumbs but no wet batter.
07 -
Cool in the pan for at least 20 minutes before slicing into squares. Serve warm or at room temperature.