I added too much water in my box cake mix and I already mixed the 2 together. What can I do to save the cake? Could I add another box of cake mix to the batter?
If you are only over by a small amount (¼ cup or less) just add half the volume of flour(±). If you added a moderate amount of extra water(½ to 1 cup) add half the volume of flour and ½ tsp baking powder and sugar equal to ⅓ the flour. Cakes fixed this way will be slightly dry but serviceable, particularly given that you started with a boxed cake anyway.
Beyond that point just make a double recipe.
I just did this this morning when making cinnamon chocolate swirl cake added 1 3/4 cups of water instead of 3/4 cups of water worried and not sure what to do I just added 1 cup of pancake mix the complete kind and hoped for the best. It took a little longer to cook but no one was the wiser and it was really good not too dry. I guess I lucked out on this one. Next time I will put my glasses on before mixing. Hope this works for you also.
1 1/2 cups all purpose flour, 1 cup sugar, 2 teaspoon baking powder, 1/4 teaspoon baking soda, Whisk together. Add to cake mix until you get the right consistency. I use this recipe to actually get a bigger yield out of a mix and then add a bit more liquid. I keep the mixture in a mason jar. Cake mixes are less ounces today and really helps getting 2 dozen versus 18 cupcakes without having to get another mix.
Yes, adding too much water into a cake batter can be fixed. What you have to do is
ADD: "Cake Flour" (not regular flour) so that it can have a thicker, fluffy and floppy texture. Test your texture by stirring it with a fork (in a vertical, circular motion).
Also, because Cake Flour does not have a flavor nor taste, you'd want to either add some POWDERED SUGAR for more taste or some WHITE SUGAR (not too much of either) because the it'll make your cake hard and crispy and it'll stop from properly rising as it should. It'll come out flat and firmer, especially around the edges if too much sugar is added. As for flavor, depending on the overall flavor of your cake, you can use ingredients like Vanilla Extract, Almond Extract, Lemon Extract, Cocoa Powder, etc. To make your cake come together and add fluffiness to it, add some baking soda to it and let it sit for about 5-10 minutes. Allow the Baking Soda to work it's magic. Baking Soda, after left sitting a while in the batter, makes your batter puffy and moussey. When it gets like that, your cake will have a wonderful texture. Then that's when you begin pouring your batter into your pan or pans. Sometimes you may not want to wait but you must wait for the baking soda it do what it needs to do in order to get the results your looking for. In reiteration, Yes, too much water in a box cake mix batter can be fixed.