Preheat oven to 350 F /177 C. Prepare an 8 x 8 baking pan with either grease and flour or parchment.
Melt 1 c chocolate chips and vegan butter, either in a double boiler or in the microwave for 2-2 1/2 minutes on 50% power. (If you use the microwave, open the door as soon as it's done heating. Chocolate will seize up if water gets into it...even just a little bit of condensation from sitting in a closed microwave will cause this.)
Add sugar, brown sugar, salt, vanilla, egg replacers and milk. Mix well. Then add in the flour, cocoa, and flax meal. Fold in nuts and chocolate chips.
Pour into prepared baking pan and bake at 350 F/ 177 C for 35 minutes. For the cleanest cuts, allow to cool completely (or overnight, if you can stand it) before cutting. These freeze really well and are super delicious straight out of the freezer.
Notes
To make these gluten free, simply substitute the all purpose and whole wheat flours for a one-to-one GF baking flour.