Step 1: In a small bowl, measure out about 8 tablespoons of chocolate peanut butter. Set aside.
Step 2: Slice the banana into thin rounds, aiming for about 1/4 inch thickness.
Step 3: In a large mixing bowl, crack the eggs and add the milk, sugar, and cinnamon. Whisk until smooth.
Step 4: Spread chocolate peanut butter on one side of a slice of Texas toast, top with banana slices, and place another slice on top.
Step 5: Melt butter in a frying pan over medium heat.
Step 6: Dip each sandwich in the custard mixture, then cook on the griddle for about 3-4 minutes per side.
Step 7: Serve immediately, topping with extra banana slices or syrup if desired.