Preheat oven to 400°F and grease a 4 x 8 inch pan.
Drain salmon juice into a measuring cup and add skim milk to the juice.
Pour the salmon juice and milk mixture into a saucepan and place over medium heat.
Blend in flour, salt, and hot sauce into the heated mixture.
Cook while stirring constantly until the mixture becomes thick.
Flake the salmon meat, removing any bones, and add to the thickened mixture.
Stir in lemon juice, egg whites, finely chopped bell peppers, and oatmeal until well combined.
Transfer the mixture to the prepared 4 x 8 inch pan.
Bake for 25-35 minutes or until the top is lightly browned and set.
Let cool for 5 minutes before slicing and serving.