Step 1: Preheat Oven & Prepare Pan: Preheat the oven to 350F (175C). Grease and flour a 9x13 inch baking pan. Proper preparation of the pan prevents the cake from sticking.
Step 2: Combine Wet Ingredients: In a large mixing bowl, combine the water, vegetable oil, and eggs. Whisk thoroughly until the mixture is well combined and slightly frothy. This ensures even distribution of moisture and fat in the batter.
Step 3: Add Cake Mix: Gradually add the cake mix to the wet ingredients, mixing on low speed until just combined. Be careful not to overmix, as this can result in a tough cake. A few lumps are acceptable at this stage. Scrape the sides and bottom of the bowl to ensure all ingredients are incorporated. If desired, stir in vanilla extract.
Step 4: Pour Batter into Pan: Pour the batter evenly into the prepared baking pan, spreading it to ensure it reaches all corners. Even distribution promotes uniform baking.
Step 5: Bake: Bake in the preheated oven for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean. Baking time may vary depending on the oven, so monitor the cake closely during the last few minutes.
Step 6: Cool Completely: Remove the cake from the oven and let it cool in the pan for 10 minutes before inverting it onto a wire rack to cool completely. Cooling prevents the cake from becoming soggy and allows it to set properly.
Step 7: Frost and Serve: Once the cake is completely cool, frost with frosting of your choice. Slice and serve. Enjoy!
Optional Tips & Substitutions:If the cake mix is slightly past its prime, consider adding an extra egg or a tablespoon of lemon juice to compensate for any loss of leavening power. The addition of vanilla extract can also help to mask any subtle off-flavors. For a richer flavor, substitute melted butter for vegetable oil. Gluten-free cake mixes can be used as a substitute, but the texture may vary.