In a mixing bowl, add eggs, cream cheese, milk, heavy cream, mozzarella, herbs, Dijon, salt, pepper and stir to combine thoroughly.
Add vegetables to the pan and cook for 3-4 minutes, stirring often. Add the spinach last and cook until the leaves start to wilt and shrink, approximately 2 to 4 minutes. Remove the pan from heat.
Add the cooked veggies to the mixing bowl and stir.
Scoop the mixture evenly into the muffin pan. Fill each muffin cup almost to the top, leaving approximately 1/4 of an inch for the muffins to rise. Sprinkle on feta or goat cheese before putting the pan in the oven
Bake for 25-30 minutes, or until the egg is cooked through and the cheese is starting to brown at the edges.
Remove from the oven and let them cool for 15 minutes before serving. Enjoy them while warm, or put them in an airtight container and store in the fridge or up to five days.