Preheat oven to 350°F.
Grease the muffin tins with olive oil.
Heat a saute pan over medium heat. Add a small amount of olive oil and then add the pancetta and diced onion. Cook until the pancetta is brown, and the onion is soft, about 5-7 minutes. Drain any excess fat and transfer the mixture to a bowl.
Whisk the eggs, half and half in a large mixing bowl. Add the black pepper, dried herbs, chopped spinach and cheese, and mix until well combined.
Then, divide the pancetta and onion mixture evenly in the muffin tin, pour the egg mixture over the top, filling each about three quarters full. They will rise as they cook.
Tranfer to the oven and bake for 20-25 minutes, until the egg is set and the tops have browned slightly.