Add the brown sugar and heavy whipping cream and stir just to combine.
1 Cup Dark Brown Sugar, ¾ Cup Heavy Whipping Cream
Stop stirring and let the mixture come to a boil over medium heat.
Once you see the caramel sauce start to boil, set a timer for three minutes.
Let the mixture boil undisturbed for those three minutes.
When the timer is done, remove the caramel sauce from the heat.
Gently stir in the vanilla and sea salt.
1 Teaspoon Vanilla, ¼ Teaspoon Sea Salt
Pour the caramel sauce into a container.
Use it fresh or store it in the fridge.
Notes
Tips and tricks.
Use a metal pan - I know the instinct here is to use a nonstick pan, but this can sometimes interfere with the heat transfer in the sugar as it cooks, which can cause it to seize easier.
Use a silicone spatula - You aren't stirring much, but I've found this works best when making this sauce as it is less of a heat conductor and will reduce heat transfer from the sugar, helping it stay at the correct temperature.
Do NOT stir as it boils. - Once you get the sugar and cream mixed gently into the melted butter, stop stirring and let it cook.
Make sure your heat is set to medium - I know there is an urge to want to turn the heat up and make the caramel come together faster, but don't.
Thinner or thicker caramel sauce. I prefer this gluten-free caramel sauce on the thinner side so that when it cools, I can still drizzle it into my coffee or even dunk some sliced apples. If you want your caramel sauce to be a bit thicker when it's chilled, you can reduce the heavy cream by a quarter of a cup. Your caramel sauce will still drizzle when it's warm but will be more solid at room temperature.