The GF volunteered me to make what is called Gob Cake around here.
Most would understand the term Whoopie Pies instead of Gobs, same thing this is a cake version.
I usually make a black forest one using cherry pie filling in the center with the cream icing but they didn't want that.
I just use boxed cake mix and add an extra egg and use milk instead of water.
The filling is a cup of whole milk and 5 tablespoons of flour cooked until it gets very thick stir or whisk while cooking over medium heat, then cooled completely, put plastic wrap on top of the mix to keep it from drying out or getting a skin on it. Once the cake is cooled, add to the icing mix 3/4 cup softened butter and 2-3 tablespoons of shortening and mix it well.I use the stand mixer with the whip, then add in 1-1.5 cups of powdered sugar. Start with 1 and see if you want it sweeter, also add in some salt 1/4 teaspoon give or take, and some vanilla. and beat it all together well.
You could add in any flavoring you like to the filling. I have added mint, banana, peanut butter and probably a few others.
now you have 2 cakes and you put the filling on one and put the other on top.
I used 1 box of cake mix for each half size sheet pan and I made 4 batches of filling.
If you want to make Gobs use a cookie scoop to portion out your cake mix and bake can probably get 6-8 on a half pan. You want an even number as you will need a top and bottom.
I am not a baker but people seem to really like these things when I make them.