Line an 8 inch x 4 inch loaf pan with parchment paper.
Add caramel and chocolate chips to a large microwave-safe mixing bowl. Heat in 15-30 second intervals, stirring in between with a spatula until chocolate is completely melted and the mixture is smooth and uniform in color. You can also melt the chocolate mixture on the stove using the double boiler method. As the caramel is incorporated into the chocolate, it will cause the mixture to turn very thick.
Add mixture to your lined loaf pan. Use your spatula to spread it evenly across and smooth the surface. Place the fudge into the freezer until set. This should only take about 30 minutes. Bring the fudge back to room temperature before cutting and serving. If desired, sprinkle coarse or flaky salt on top of the fudge. Uneaten fudge can be stored in the fridge.
Notes
You can use salted or regular caramel sauce but it needs to be a thick caramel topping. This is the kind that is usually used for an ice cream topping. It is usually sold in glass jars and needs to be warmed up before using. Do not use a caramel sauce that comes in a squeeze bottle because that will not be thick enough. I tested this with Smucker's caramel topping and salted caramel topping.
You can also use milk chocolate instead of semi-sweet but the fudge will be much sweeter and will also be a little softer.
The flaky salt on top is completely optional. Since I like the flavor of salted caramel, I thought the flaky salt would be nice decoration and add more salt to the fudge.
The nutrition estimate does not include the optional salt on top and is calculated using Smucker's salted caramel topping.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.