01 - Preheat oven to 350°F. Lightly grease a standard 12-cup muffin tin with butter or nonstick spray to prevent sticking.
02 - Evenly divide the cubed bread among the muffin cups, filling each approximately three-quarters full.
03 - In a large mixing bowl, vigorously whisk together eggs, milk, heavy cream, granulated sugar, vanilla extract, cinnamon, and salt until fully blended.
04 - Carefully pour the custard mixture evenly over the bread cubes in each cup, pressing lightly to encourage absorption.
05 - Allow the assembled muffin tin to sit for 10 minutes so the bread absorbs the custard.
06 - Top each cup with fresh berries, if desired.
07 - Place the muffin tin in the oven and bake for 25 minutes, or until the tops are golden brown and the centers are fully set.
08 - Allow baked French toast cups to cool for 5 minutes before gently removing from the pan with a small offset spatula.
09 - Serve warm, dusted with powdered sugar and drizzled with maple syrup as desired.