To any boxed cake mix you can add/substitute:
- add an extra egg
- substitute the water called for in the recipe with milk {same amount as is called for}
- substitute the oil called for in the recipe with melted butter {same amount as is called for}
- add a small box of instant pudding {added with the cake mix}
- add extract {1 teaspoon of your favorite extract}
These alternatives add a little more of a rich taste and improves the texture.
You can try some substitutions/additions or all - give it a try and see what you think!