Line a baking tin with parchment/baking paper or use a non-stick baking tin. Heat oven to 350f/180c/gas mark 5
Heat a pan of water or use a microwave in increments. Put butter, sweetener, cocoa power, salt in a heatproof bowl
Heat over the stove and whisk it / take out of microwave in increments and mix each time. Keep doing this until the sweetener has melted. Note: Erythritol doesn’t dissolve as much as xylitol so it might still look grainy when using erythritol.
Remove from heat. Add in the eggs and whisk to create a smooth mixture. If using erythritol and it seems too thick, add another egg.
Add the almond flour and whisk in.
Transfer the brownie mix to a the baking tin. Spread out evenly.
Add the sugar free chcoolate chips. If you're also adding nuts you can add them at this stage. Bake for about 15 to 20minutes depending on how gooey you want them.