Pre-heat oven to 325 degrees and lightly grease an 8X8 baking pan.
Using a double boiler, melt the butter, sugar substitute, cocoa powder, unsweetened baking chocolate, instant coffee and salt.
Stir occasionally until fully combined.
Allow mixture to cool slightly.
Add the eggs one at a time and the vanilla extract.
Once the mixture is fully combined add the sifted almond flour, baking powder and gently stir.
Lastly, fold in the walnuts.
The addition of the walnuts is totally optional but delicious decision.
Pour the low carb keto brownie mixture into the prepared pan.
Bake the brownies for 20-25 minutes.