Prepare the custard: In a mixing bowl, whisk together 1 large overripe banana, mashed, 4 large eggs, 1/4 cup half and half, 1/2 tbsp cinnamon, 1 1/2 tbsp sugar, and 1/4 tsp salt until the mixture is smooth. Ensure the banana is well incorporated for an even flavor.
Heat the oil: In a large skillet or frying pan, pour in enough oil for frying to reach about an inch in depth. Heat it on medium-high until it reaches around 350°F. You can check the temperature by dropping a small piece of bread into the oil; if it sizzles immediately, it's ready.
Prepare the panko coating: While the oil is heating, pour 8 oz of panko breadcrumbs into a shallow dish. This will be used for breading the French toast slices.
Dip the bread: Take 6-8 pieces of bread and dip each slice into the banana mixture. Ensure to allow any excess batter to drip off, letting chunks cling to the surface. Next, coat both sides of each slice in the panko breadcrumbs, pressing gently to adhere.
Fry the French toast: Once your oil is hot, carefully add the coated slices one or two at a time, depending on the size of your skillet. Fry until they are golden brown, about 3-4 minutes per side. Monitor closely to prevent burning.
Cool and serve: Once fried to perfection, place the French toast on a cooling rack or paper towel-lined plate to absorb any excess oil. Serve warm, drizzled with maple syrup and perhaps topped with fresh fruit or a sprinkle of powdered sugar for added sweetness.