01 - Preheat oven to 350°F (175°C). Lightly grease a standard 12-cup muffin tin with butter or nonstick spray.
02 - Distribute the bread cubes evenly among the muffin wells, filling each approximately three-quarters full.
03 - In a large mixing bowl, vigorously whisk eggs, whole milk, heavy cream, granulated sugar, vanilla extract, ground cinnamon, and salt until fully blended.
04 - Carefully pour the custard mixture over the bread cubes in each muffin cup. Gently press bread to ensure thorough absorption of liquid.
05 - Allow the filled muffin tin to rest for 10 minutes, enabling the bread to soak up the custard.
06 - Top each cup with fresh berries if using.
07 - Place muffin tin in the oven and bake for 25 minutes, or until the tops are golden and centers are set.
08 - Transfer pan to a wire rack and cool for 5 minutes. Carefully lift each French toast cup from the tin.
09 - Serve warm, dusted with powdered sugar and accompanied by maple syrup.