In a shallow bowl, whisk together the eggs (or egg whites), milk, protein powder, cinnamon, vanilla extract, and salt until well combined and smooth.
Dip each slice of bread into the protein mixture, ensuring both sides are coated.
Heat a lightly oiled griddle or non-stick skillet over medium heat.
Cook the French toast for 3-4 minutes per side, until golden brown and cooked through.
Alternatively, for air fryer method: Preheat your air fryer to 375°F (190°C). Lightly spray the basket. Place the coated bread slices in the basket and cook for 5-7 minutes, flipping halfway through, until golden brown.
Serve immediately with your favorite toppings.
Notes
For a thicker batter, add a tablespoon more milk.
Ensure your protein powder is fully dissolved to avoid clumps.