Completely oil the muffin tins. This recipe makes 6 muffins.
Scoop 3 Tbsp of batter into each muffin cup.
Crack an egg into each (or egg yolk only) cup.
Sprinkle the bacon and cheese filings if using.
Fill the muffin cup with more batter to 2/3 full.
Top each muffin with more chives or green herb toppings and 1/2 Tbsp parmesan cheese.
Bake on a medium to high shelf for 18-20 minutes or when it is golden brown and fluffy.
Serve warm.