Slice the loaves of bread lengthwise (do not cut all the way through, the loaf should open like a book). Pull out a little bit of the "fluffy" bread inside along the whole loaf. This will make more room for the filling.
Split the peaches and cream filing into thirds. Put aside one-third of the peach filling for later use. Spoon a third of the filing into each loaf of bread. Refrigerate the stuffed bread overnight. This allows the bread to set so that it won't separate during cooking time
Cut off and discard the ends of the bread. Use a serrated knife to slice the stuffed loaves into 1 1/2-inch slices.
In a frying pan, heat the oil until hot. Dunk the stuffed slices into the egg mixture and pan fry. Flip the slices over when they are golden brown. When both sides are done, remove the French toast from the pan and set on a paper towel to absorb excess oil for 1 minute.