I Have in mind a hybrid fudge/brownie idea.
This features a rich brownie bottom,. covered by a silky-smooth chocolate fudge, and topped with a crackly-top fudge. The fudge recipe in the center can be any flavor you want, such as maple-nut, peanut butter, or pistachio fudge, vanilla, or you could put a good pastry, cream, or even you favorite fruit jam.
I looked up some really good recipes for the brownies, and so e creamy fudge recipes.
To put this together, I would divide a single brownie recipe into two into two parts, with each half going into a well butted, and floured 9X 12 cake pan. Bake and let cool. Make the fudge, and pour on top of one of the pans of brownies. On second thought, make the brownies in two spring-form pans. That way, the pan sides can be removed, making it easier to remove the top brownie sheet to place on top of the fudge.
If you think about this technique, you could make the middle layer out of fudge, pastry cream, fruit jam, or even cheesecake filling. To make the Cheesecake filling, remove the fudge from one of the springform pans onto parchment paper. The, linee the the spring-form pan with parchment paper, butter, and pour in the cheesecake filling. Bake until the custard is set. When cooled, gently slide the whole custard from the pan, and on top of the first brownie layer. Then top with the 2nd brownie layer.
I know this works as I have made multi-layered cheesecakes this way.
You could get really fancy with https://www.food.com/recipe/maple-nut-fudge-167821this
desert. Here are a few freat recipes that would work:
World’s Smoothest Chocolate Fudge
If I were able to wlak (wound on heel is still healing), i would make this today. I think I'd make the maplenut version.
Seeeeya; Vhief Longwind of the North