In a shallow dish, whisk together liquid egg whites, whey protein powder, almond milk, cinnamon, vanilla extract, and sweetener until smooth and free of clumps.
Slice each bread slice into three vertical strips to create sticks.
Preheat a large non-stick skillet over medium heat and coat with cooking spray.
Dip each bread stick into the egg mixture, allowing them to soak for 5-10 seconds per side until fully saturated but structurally sound.
Transfer the sticks to the hot skillet, cooking in batches if necessary.
Sear for 2-3 minutes per side or until the exterior is golden brown and the egg mixture is set.
Remove from heat and serve with sugar-free syrup or fruit.