Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C). Grease and flour a 10x15-inch jelly roll pan.

Sift together flour, baking soda, cinnamon, and salt in a large bowl. Set aside.

Beat together sugar, oil, and eggs in another large bowl until smooth.

Mix in flour mixture until just combined. Stir in carrot baby food until incorporated.

Spread batter into the prepared pan.

Bake in the preheated oven until a toothpick inserted into the center of cake comes out clean, about 20 minutes.

Allow cake to cool completely on a wire rack before frosting and slicing.