My neighbor made these and they were so good. They actually baked with a cakey layer top and bottom and a fudgey one in between. She used chocolate chips instead of chopping chocolate and didn't add the additional ones on top. These can be made gluten-free by changing flours. Almond milk can be used for dairy, but not sure about a yogurt substitute.
For this layout I used:
SNU SS Styles: Shadow Me
SNU Pixie Mischief Nano
SNU SS Styles: Sanded Edges
photo is from the online recipe