Step 1: Line with parchment paper or apply the non-stick cooking spray in an 8×8-inch baking dish.
Step 2: In a large mixing bowl, add in the chocolate chips, butter, and vanilla. Whisk until well mixed.
Step 3: In a 6-quart saucepan, add in the milk, marshmallows, and sugar.
Step 4: Place the saucepan on the stove and turn the heat to medium.
Step 5: Allow the mixture to boil or until it reaches a temperature of 230 degrees F. Make sure to stir continuously for about 5 minutes.
Step 6: Pour the mixture on top of the chocolate-butter.
Step 7: Stir until well combined using a spatula.
Step 8: Transfer the fudge into the prepared baking dish.
Step 9: Let it sit for 1 hour until it becomes hard.
Step 10: Remove the fudge from the baking pan and slice them into even pieces.
Step 11: Serve and enjoy!
Place any leftovers in an airtight container, then place it inside the fridge.
Amount per Serving: CALORIES: 157 TOTAL FAT: 6g SATURATED FAT: 4g TRANS FAT: 0g UNSATURATED FAT: 2g CHOLESTEROL: 10mg SODIUM: 35mg CARBOHYDRATES: 26g FIBER: 1g SUGAR: 25g PROTEIN: 1g