A spline might be nice. If you have a way to cut a blind groove then
you wouldn't be able to see the edges of the spline in the finished
product. You could also do a lap joint, which is pretty strong and is
nice and square.

Fancier: if you have a router, you could use a frame and stile type of
bit set, which creates matching grooves in the joining sections (one
bit makes the negative of the other, so they'll fit together). It
would rout the groove for the mirror at the same time and leave a nice
detail around the inside face.

-Marc-

"Patrick Gillette" wrote in message news:Y6cZb.79315$jk2.420120@attbi_s53...
I'm building a medicine cabinet and was planning on using small biscuits to
join the corners of the door. However the Cheap-O biscuit joiner I own makes
the hole too big for the smaller biscuit. I've tried to make it work, but it
just won't do what I want.

Is a spline a safe way to join the corners? They're not at 45 degrees but
butted against each other. Any other alternatives? I wanted to stay away
from using L brackets, but that may be the only solution. I have very basic
tools to match my basic skills.

Thanks.