Can anyone suggest a good MUI based react admin template?

I would suggest the Materio MUI React NextJS Admin Template. I purchased it last week for my project and I am so satisfied with the product quality and ease-of-use.

Also, the team is very responsive whenever needed the support. In case you want to check if it is suitable for your project or not then there is a free version as well.

You can check the theme here: https://themeselection.com/item/materio-mui-react-nextjs-adm...

I hope you find it helpful.