To make the mint chocolate fudge sauce, add the heavy cream, powdered erythritol, and peppermint extract to a saucepan. Place it over medium heat and let it heat. Remove it from the heat the moment it starts to simmer.
Step 2
Chop the dark chocolate and add it in. Stir until it melts. Taste and adjust the sweetness to your liking. Transfer to a jar and let it sit for 10 minutes.
Step 3
To assemble, add 2 tbsp of fudge to the bottom of a sundae cup. Add 2 scoops of ice cream and drizzle 2 more tbsp of mint chocolate fudge. Top with chopped nuts, and serve immediately!