Preheat oven to 350°F. Line an 8-inch square baking pan with parchment paper. Set aside.
In a bowl, combine the wet ingredients. Whisk until well incorporated.
In a separate bowl, combine the dry ingredients until no flour patches remain. Fold in nuts and chocolate if using.
Fold dry ingredients into wet ingredients. Pour into prepared baking pan. Using a rubber spatula, smooth into an even layer.
Bake for 20-30 minutes, until the edges brown. Allow to cool for about an hour. Lift out, slice and enjoy!
To Freeze - lift, slice, put in gallon ziplock bag and suck all the air out. To reheat either thaw overnight in the fridge or defrost in the microwave. If making a double recipe, I cook them in 2-8 inch pans. If you use a larger pan increase the cooking time accordingly.