Fill a heavy bottom pot 5-6 inches deep with vegetable oil. Use an oil or candy thermometer in the oil to monitor the temperature. Bring oil to 375°F.
Add pancake mix, milk, vegetable oil and egg to a mixing bowl.
Whisk until most of the lumps are gone. Batter should be thick enough to coat your s'mores without the batter running off. Add more mix if the batter is too runny or more milk if it is too thick. Let batter sit for 5 minutes.
Stack a s'more by breaking your graham cracker sheets in half so you have 2 squares. Place one square down and put a marshmallow on top, then a square of chocolate (half a Hershey bar) then the top graham cracker. Make 8 of these.
Coat s'more in batter, holding them together with you hands or tongs. Shake gently to remove excess batter.
Gently place battered s'more into the hot oil. Hold the s'more in the hot oil with tongs for a couple seconds beore releasing the tongs. This will help the batter start to cook up and keep the s'more together. Alternatively, just hold half the s'more in the oil with your hands, being very careful to keep your fingers away from oil splatter.
Use a slotted spoon or heat resistant spatula to flip the s'more over contunually to cook evenly.
Remove from oil when the whole s'more is a deep golden brown. Place on a wire rack covered in paper towel to absorb excess oil. Repeat with the rest of the s'mores.
Allow to cool for 5-10 minutes then eat wile warm.