I am a newbie and have been lurking around the boards for awhile. So much great info on here! I have read the posts about freezing cake batter and know it can be done successfully, however I am wondering if you can mix batter that has been frozen with freshly made batter and still get good results? I'll be using the WASC recipe. Thank you all for your expertise!

i never do this -- but if i did i would defrost it and slip it into the mixer on the last few go 'rounds so it all incorporates -- I'd figure it might come out a bit different color or texture a bit so i'd give it a good mix

but i would never do this because i think it takes a flavor bang and freshness punch out of your product --i would have baked it off in the first place as cupcakes or a cake layer that I could freeze -- i just would never trust it in that state -- the double acting baking powder would be shot -- just have to add a tad (of bp)  but i'd recommend not doing this going forward --

best to you

I've done it and it works fine.  You'll never know the difference.  The second action of the double acting bp reacts to heat, so it's still in there.