01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease each cup with cooking spray or oil.
02 - Whisk together eggs, milk, protein powder, maple syrup, cinnamon, vanilla extract, and salt in a large bowl until completely smooth and well combined.
03 - Add bread cubes to the egg mixture. Fold gently until all bread is evenly coated and has absorbed most of the liquid. Allow mixture to rest for 5 minutes to ensure thorough absorption.
04 - Divide the soaked bread mixture evenly among the 12 muffin cups, pressing down lightly with a spoon to compact the mixture in each cup.
05 - Sprinkle your choice of toppings—chopped nuts, chocolate chips, or fresh berries—over the top of each muffin, pressing lightly to adhere.
06 - Bake for 20–25 minutes until muffins are puffed, golden brown on top, and set in the center. A toothpick inserted should come out clean.
07 - Allow muffins to cool in the tin for 5 minutes before transferring to a wire rack. Serve warm or at room temperature.