01 - Preheat oven to 350°F. Grease a standard 12-cup muffin tin using butter or nonstick spray.
02 - Divide the cubed bread evenly among the muffin cups, filling each cup about three-quarters full.
03 - In a large mixing bowl, whisk together eggs, whole milk, heavy cream, granulated sugar, vanilla extract, ground cinnamon, and salt until fully incorporated.
04 - Pour the custard mixture evenly over the bread cubes in each muffin cup, pressing the bread gently to help it absorb the liquid thoroughly.
05 - Allow the muffin tin to rest for 10 minutes so the bread can soak up the custard mixture.
06 - Top each cup with fresh berries if desired.
07 - Bake in the preheated oven for 25 minutes, or until the tops are golden brown and the centers are set.
08 - Let the French toast cups cool for 5 minutes before gently removing them from the muffin tin.
09 - Serve warm, dusted with powdered sugar and drizzled with maple syrup as desired.