Preheat oven to 375 degrees.
Grease your quiche pan with 1 Tbsp butter, ghee or lard.
Add hash browns to quiche pan, press down and sprinkle 1/3 of the mozzarella cheese on top. Bake for 10 minutes while prepping the filling.
OPTIONAL: Fry the bacon in a skillet, then set aside and chop.
Lightly pan-fry the chopped veggies in the same pan with the bacon grease. If you are not using bacon, then add another 1-2 Tbsp of butter, ghee or lard to cook the veggies in.
Remove the quiche pan from the oven. Sprinkle in the goat cheese (if using), and then top with cooked bacon & veggies.
Whisk together 1 dozen eggs and 1/4 cup of milk. Season with salt & pepper, and herbs (if desired).
Gently pour the egg mixture into the quiche dish and give it a little "jiggle" so that everything settles.
Sprinkle the remaining mozzarella cheese on top and finish with parmesan cheese (if desired).
Bake for 35-40 minutes.