1. To prepare "eggshells," bring a large pot of water to a boil. Holding an egg in one hand, tapered end up, cut off top with an egg topper, squeezing gently and using a scissor motion. Pour egg into a bowl and repeat with remaining eggs. Boil shells 5 minutes, then gently transfer to a wire rack with a slotted spoon; let dry, cut sides down.

2. Add cream to eggs and season with salt and pepper. Beat with a fork until frothy. Melt butter in a large skillet over medium heat. Pour in egg mixture. Cook, using a heatproof flexible spatula to gently pull eggs to center of pan and letting liquid parts run underneath, until just set, 2 to 3 minutes.

3. Transfer eggs to a pastry bag fitted with a 1/2-inch plain round tip. Place shells in egg cups, then pipe scrambled eggs into the shells. Top with salmon roe (about 1 teaspoon per shell) and serve immediately.