1-Combine ingredients: Start by gathering all your ingredients and measuring them out to make the process go smoothly. In a medium saucepan over medium heat, combine the chopped semi-sweet chocolate, granulated sugar, heavy cream, light corn syrup, unsweetened cocoa powder, and salt. Whisk everything together until the chocolate melts completely, which takes just a few moments.

2-Bring to boil: Once mixed, bring the sauce to a boil while whisking occasionally to ensure even cooking. Let it cook for about 3 minutes until it reaches 220 degrees Fahrenheit use an instant-read thermometer to check for accuracy.

3-Stir in butter and vanilla: After that, remove it from the heat and stir in the softened unsalted butter and pure vanilla extract until the mixture is silky smooth.