In a sauce pan, melt butter and allulose over low heat.
Stir continuously until the butter and allulose is completely melted and begins to boil. This will take about 5 mintues.
Let the mixture boil for 3 mintes while you stir.
Keep stirring and slowly pour in the cream. Continue stirring while the mixture cooks and reduces for about 4 minutes. The sauce should coat the back of a spoon and there should be a line around the inside of the pan where the sauce has reduced.
Once the sauce has reached the desired consistency, transfer to a small glass jar and let cool until ready to use.
Notes
This caramel sauce should keep well in the fridge for a couple of weeks in a well sealed jar. It will firm up in the fridge but it will still be pliable and "scoopable", like a soft caramel candy. As soon as it reaches room temperature, or is microwaved, it will liquify again. Be careful microwaving too long as it will get very runny.Alternative flavors: add in flaky salt for a salted caramel or vanilla extract (after cooking) for a vanilla caramel.