Whisk eggs and add everything bagel seasoning, onion, tomatoes and capers.
Depending on the type of salmon used flake the cured or smoked salmon into the bowl with the eggs. If using a fillet, season the salmon with some additional everything bagel seasoning and cook until medium in a skillet, a few minutes per side. Then flake into the bowl with the eggs.
Transfer the egg mixture to a greased pie dish and bake until the eggs are set, about 25 minutes.