Gluten Free and Peanut Free!
First, Betty Crocker’s new gluten free cake, brownie and chocolate chip cookie mixes. While this is not the easiest option, if I have the time, these work well. They all taste pretty good. Everything gluten free tastes better when it just comes out of the oven anyway. But it does require ½ hour of time. But it is also a good activity for play dates. Kids generally love to help make treats. So even if you are short on time, you can have the kids help.
Another option is checking Peanut Free Planet which has a lot of snacks that are both peanut and nut free, and even kosher, if you need that option. One of the great things about this site is that you can search by allergen.
And the Ener-G Wylde pretzels are also both gluten and peanut free, and kosher.