01 - Preheat oven to 350°F. Lightly grease a 6-cup muffin tin with olive oil or melted butter.
02 - In a mixing bowl, whisk together the eggs, milk, salt, and black pepper until thoroughly blended.
03 - Fold shredded cheese, chopped smoked salmon, red onion or shallot, chopped spinach, and dill into the egg mixture.
04 - Evenly divide the prepared mixture among the six muffin cups, filling each about three-quarters full.
05 - Bake for 18 to 20 minutes, or until set and lightly golden on top.
06 - Allow muffins to cool for 5 minutes. Run a knife around the edges to loosen and carefully remove from the tin.
07 - Garnish with extra dill if desired. Serve warm or at room temperature.