Bring first 2 ingredients to a rolling boil in a 3 1/2-qt. saucepan over medium heat, whisking constantly.
Stir in cream, and return to a boil; remove from heat. Pour into bowl of a heavy-duty electric stand mixer. Gradually beat in powdered sugar and vanilla at medium speed, using whisk attachment; beat 7 to 10 minutes or until thickened. Use immediately. Sprinkle frosted cake with sea salt.
This is the best caramel frosting I've ever eaten! It has the flavor of rich homemade caramel and a texture similar to regular buttercream, just a little more firm. I used it with a homemade vanilla cake.
Sign Up for our Newsletter
Join our newsletter for free recipes, healthy living inspiration, and special offers.