Just get a Stealth Bomber and be done with it 😀
On a serious note, if you wanted a decent mtb with electric power I believe Cube, Corratec, KTM and Scott may have suitable offerings. I’m sure there are more too!
If you’re more into DIY and want more power (and maybe a more capable bike) then you could look at a DIY option such as a hub motor into an existing bike.
I think some of the manufacturer bikes are looking pretty good these days though – especially those with Bosch power.