From breakfast omelets and French toast to fried rice and decadent cakes, eggs play an important role in the kitchen. But nowadays, they can come at a high price—that is, if you can find them at all.

Boxed mixes are often looked down on, but the reality is that they are helpful items to keep in the pantry for when you want some baked goodness that can be made in a pinch. Boxed brownie mixes (and ...