Line a loaf pan with parchment paper (or use a silicone loaf pan).
Mix egg whites with date sugar and psyllium husks.
Add protein powders, rye flour, and salt. Mix well.
Fold in the caraway seeds.
Bake for 50-55 minutes.
Let cool, and enjoy!
Store in the refrigerator or freezer.
Notes
A note about substitutions: because each type of protein powder has a distinct flavor and texture when baked, I would not try substituting different types of protein powders in this recipe.