Step 1: Preheat your oven to 350°F (175°C).
Step 2: Lightly grease your loaf pan with cooking spray or line it with parchment paper.
Step 3: In a large mixing bowl, whip the egg whites until they form stiff peaks (about 5-7 minutes).
Step 4: In a separate bowl, mix together the whey protein powder, almond flour, psyllium husk powder, baking powder, and salt.
Step 5: Gently fold the dry mixture into the whipped egg whites.
Step 6: Pour the batter into the prepared loaf pan and smooth the top.
Step 7: Bake for 30-35 minutes until golden brown and a toothpick comes out clean.
Step 8: Let it cool in the pan for 10 minutes, then transfer to a cooling rack.