Preheat oven to 400F.
Grease a baking dish with about 1 Tbsp of melted butter or olive oil.
Slice salmon fillets about 1/4" think, lengthwise. Lay the salmon on the bottom of the baking dish and sprinkle with lemon juice. Lay the sliced hard boiled eggs on top.
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In a medium size bowl, mix the eggs with heavy cream, salt, pepper, mustard and finely chopped fresh dill. Pour evenly over the eggs.
Spread the shredded Gouda over the eggs.
Bake at 400F on the top rack for about 15-20 minutes, depending on your oven. Check the temperature of the bottom layer - the salmon is ready when it reaches the temperature of 145F.
Remove from oven and garnish with sun-dried tomatoes and chopped scallions. Serve immediately.