Best way to join three axes?

[Deadeye]

Not axes for chopping wood. Three mutually perpendicular pieces, each around 50mm square.
I need to make a frame so need a joint for the corners and also for two pieces meet mid-way along a third.
I'm assuming M&T about 16mm wide and the same deep?

Thanks!

 

[marcros]

I would domino it, but same principle as you suggested.

 

[Jameshow]

You could make the tenons beveled so the outside edge is 32 mm long giving greater gluing area.

Don't know if that is acceptable woodworking???

Cheers James