There's only one way, I've been there. Make another batch, no chili powder, and mix them. Then freeze half.
Also, I've sometimes made it a tad too hot for me, not too much, and add a large dollop of low-fat sour cream to the bowl, and by taking a little sour cream with each bit it cuts the heat amazingly!
By the way, if you're going to freeze it, be aware that it often comes out hotter than before it was frozen.
