Preheat the oven to 350 F. Line a metal or glass 9x9 pan with parchment paper.
In a microwave-safe bowl, add the chocolate and butter and microwave for 30-60 seconds or until melted.
Pour the chocolate mixture into a larger bowl. Add the sweetener to the mixture and whick until smooth.
Add one egg at a time, stirring between until each gets incorporated. Add the flour, and stir.
For the nuts, you can either chop them to get chunks to add into your brownie or you can blend on high for 10 seconds or just until they are broken up in fine pieces.
Pour the batter into your pan, add the nuts, and bake for 25 minutes.