Did you know... that many boxed brownie mixes are accidentally vegan?*
However, obviously vegans cannot follow the directions on the side of the box, as they usually recommend adding eggs. Instead, here are some adjustments I've made so that boxed brownies can be made in a vegan way.

1. A boxed brownie mix that does not already contain eggs or milk. I used Betty Crocker's Walnut Brownie Mix here. If you use a different mix and the brownies don't come out... don't blame me. Baking is a science.

2. Egg substitutes. I first tried making a "chia egg" (a mixture of chia seeds and water, sometimes blended, that forms a gelatinous texture similar to that of an egg) for this purpose as I heard good things about it online. However, the brownies I made with it did NOT turn out well at all, the batter started boiling in the oven and refused to set. My preferred substitute: 5 tablespoons of "aquafaba," the liquid found in cans of beans. I used the liquid from white kidney beans (cannellini) and garbanzo bean aquafaba *should* work.

3. Keep the amount of oil recommended by the box. This isn't the time to substitute applesauce or whatever.

4. Cook in a large cast iron skillet for longer than the package recommends. This I especially recommend if you like the corners and edges of brownies more than the middle... the whole thing was like that when I did this! **

5. Ta-da! Vegan brownies!

*Note: If as a vegan you avoid white sugar due to bone char filtering concerns, then I'm not sure if these brownie mixes work for you. Sorry :((((
**I will say the brownies were a bit hard to remove from the skillet. Once they were out though they were delicious.