These rich and chocolaty vegan brownies are easy to make and perfect for satisfying your chocolate cravings!
Preheat the oven to 350°F.
Oil a 9 x 9 inch square baking pan and line the bottom with parchment paper.
Place the butter, sugar, brown sugar, and vanilla into a large mixing bowl. Use an electric mixer to whip the ingredients together for 2 full minutes.
Stir in the melted chocolate chips by hand, followed by the milk.
Add the flour to the bowl, then sprinkle the cocoa, baking powder, cinnamon (if using) and salt on top of the flour. Stir everything together just until fully mixed. The batter will be very thick — almost like cookie dough.
Fold in the nuts, if using.
Spread the batter evenly in the prepared baking pan.
Place the pan into the oven and bake just until edges begin to pull away from the sides of the pan, about 30 minutes.
Remove the pan from the oven and transfer it to a cooling rack. The brownies will continue to set as they cool.
Slice into 9 squares and serve.