I've used nuts, but also Atkins Bake mix, vanilla shake mix, and the (overpriced) Carbolite Bake mix.. unfortunately, I never measure, but just mix butter in with some of the bake mix and a packet of Splenda, until crumbly.

I bake it at 375 for about 8 minutes (should be firm but not too brown).

In my experience, they all work about the same. I prefer the Atkins mix, but it does have a little "soy" taste to me.