Here is what I have done and it is something I just made up and have not read anywhere, but it has worked for me just great. !
Add 1-2 cups of Bisquick to the mix (depending on how large a pan you are using. if you are using a 9 X 13 pan then 2 cups is the way to go. I have used a 9 X 9 pan with the same amount of ingredients as a 9 X 13, but in a 8 X 8 pan I have added just the one cup of Bisquick and reduced the additional ingredients, that I show below, to half of those amounts.
Use all of the ingredients found on the package PLUS
add 2 eggs (Beaten)
1/4 cup oil
1/2 stick butter (sofened)
1/2 cup sugar
1/4 cup milk (Optional and depnding on what it is you are making)
and then whatever flavorings or additions such as friuit, pecans, walnuts , candy chips etc... that you are going to use.
Hope this helps.
Vickie P