These brownies will last for 4 to 5 days at room temperature.
Make sure you slice when they are cool or even chill for half an hour or so before slicing.
You can also bake in a 9 inch square pan for 28 to 32 minutes for thinner brownies.
Use vegan flour and sugar if you prefer.
I used chocolate chips and the brownies were just sweet enough. You can reduce the sugar but be careful because that will change the texture of the brownies to more cakey-fudgey.