Ingredients:
1 cup firmly packed dark brown sugar
1 cup butter
1/3 cup heavy cream
4 cups powdered sugar, sifted
1 teaspoon vanilla extract
1/2 teaspoon sea salt
Directions:
Step1: Bring first 2 ingredients to a rolling boil in a 3 1/2-qt. saucepan over medium heat, whisking constantly.
Step2: Stir in cream, and return to a boil; remove from heat.
Step3: Pour into bowl of a heavy-duty electric stand mixer.
Step4: Gradually beat in powdered sugar and vanilla at medium speed, using whisk attachment; beat 7 to 10 minutes or until thickened. Use immediately.