Cut each slice of bread into three equal strips.
In a wide shallow bowl, whisk together the eggs, milk, heavy cream, sugar, vanilla, cinnamon, nutmeg, and salt until well combined.
Heat a large non-stick skillet or griddle over medium heat and melt 1 tablespoon of butter.
Working in batches, dip the bread strips into the custard mixture for 5 seconds per side, ensuring they are coated but not soggy.
Place the dipped strips onto the hot skillet and cook for 2 to 3 minutes per side until golden brown and slightly crisp.
Add the remaining butter to the pan for the second batch and repeat the cooking process.
Serve immediately with maple syrup or a dusting of powdered sugar.