I guess you can consider this one of those isekais which are not really isekai and those niche (but lately popular), where the new world is practically without dangers, and characters just live mostly quite life. I mean opening filled with cakes kind of showed the tone exactly. Even the “demon lord” is not that “demon”, although still a flat character trying to look like and edgelord. This can be a guilty pleasure for some, but I will pass.

Konyaku Haki sareta Reijou wo Hirotta Ore ga, Ikenai Koto wo Oshiekomu: Oishii Mono wo Tabesasete Oshare wo Sasete, Sekaiichi Shiawase na Shoujo ni Produce!
Deep in the forest lives Allen, a misanthropic wizard. He is called "Demon Lord" and feared by those around him. One day, while living out his lif...