In a large mixing bowl, crack one large egg, then add 1/4 cup of Greek yogurt, 1/2 teaspoon of ground cinnamon, and 1/2 teaspoon of vanilla extract. Whisk until well combined and creamy.

Slowly incorporate 1/3 cup of protein powder into the mixture, whisking thoroughly. Pour in 1/4 cup of milk to adjust the batter consistency.

Dip each slice of bread into your custard mixture, allowing to soak for about 30 seconds on each side.

Heat a non-stick skillet over medium heat and lightly grease it. Place each soaked slice into the skillet, cooking for about 2-3 minutes until golden brown. Flip and cook for an additional 2 minutes.

Transfer cooked French Toast onto a plate and serve with desired toppings.