01 - Preheat oven to 350°F. Grease a 6-cup muffin tin with olive oil or melted butter.
02 - Whisk together eggs, milk, salt, and black pepper in a mixing bowl until fully combined.
03 - Fold in shredded cheese, chopped smoked salmon, red onion or shallot, spinach, and dill.
04 - Divide mixture evenly among muffin cups, filling each about three-quarters full.
05 - Bake for 18 to 20 minutes, or until muffins are set and lightly golden on top.
06 - Let muffins cool for 5 minutes, then run a knife around edges to loosen and remove them from the tin.
07 - Garnish with additional fresh dill as desired. Serve warm or at room temperature.