Combine the Basics: In a medium-sized saucepan, add the sugar, heavy cream, and butter. Turn the heat to medium-low and stir gently until the butter melts and the sugar dissolves.
Simmer for Perfection: Once the mixture is smooth, bring it to a gentle boil. Reduce the heat to a simmer and let it cook for about 4–5 minutes, stirring occasionally to prevent sticking.
Add Flavor and Texture: Remove the pan from heat and stir in the vanilla extract or paste. Immediately add the baking soda, whisking quickly. The syrup will become light and fluffy.
Cool and Serve: Let the syrup cool for a few minutes before serving. This will thicken it slightly and make it easier to pour over your favorite dishes.