Shirokuma Tensei: Mori no Shugoshin ni Natta zo Densetsu
Reborn as a Polar Bear: The Legend of How I Became a Forest Guardian

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Both are classic isekai stories where the protagonist gets reincarnated in a fantasy world. The main characters have similar activities : which is to build houses (actually a whole village for one of them) and cook with what nature gives them. And so, both MCs use their knowledge from their past life to do these things and help the other characters. They're also both surrounded by non-human girls who have the hots for them.