Easy Tomato Spice Cake

Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x13-inch cake pan and set aside.

Whisk cake mix, tomato soup, milk, eggs. and cinnamon together in a bowl until well combined. Pour into the prepared pan.

Bake in the preheated oven until a toothpick inserted into the center comes out clean, 28 to 33 minutes. Cool on a wire rack for 5 minutes. Run a table knife around the edges to loosen. Invert carefully onto a serving plate or cooling rack. Let cool completely.