01 - Preheat the oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease each cup with cooking spray.
02 - In a large bowl, whisk together the eggs, milk, protein powder, maple syrup, cinnamon, vanilla extract, and salt until completely smooth and well combined.
03 - Add the bread cubes to the egg mixture, tossing gently until all pieces are well coated. Allow the mixture to sit for 5 minutes so the bread absorbs most of the liquid.
04 - Divide the soaked bread mixture evenly among the 12 muffin cups, pressing down lightly with a spoon to compact the mixture.
05 - Sprinkle your choice of toppings—nuts, chocolate chips, or berries—over each muffin cup.
06 - Bake for 20–25 minutes until the muffins are puffed, golden brown on top, and set in the center.
07 - Let the muffins cool in the tin for a few minutes before removing. Serve warm or at room temperature.