Turn oven on to 375 degrees F.
Wash the leeks in water, making sure to get between layers, then dry them. Use the large knife and cutting board, to cut the leeks in half, lengthwise. Using only the white and light green part, slice then loosely chop them. This should equal between 1.5 to 2 cups, chopped. Set aside.
Place a pan on the stove and turn the heat to medium. Put the sausage in the pan, breaking it up with a wooden spoon or other utensil. Cook the sausage until it's no longer pink, then remove the sausage from the pan and set on top of a plate with a paper towel to drain the fat.
Add the ghee to the pan and throw in the chopped leeks and sliced mushrooms. Cook, stirring often with the wooden spoon, until both are soft, 8-10 minutes.
While mushrooms and leeks are cooking, grease a 9x13 dish with some ghee.
In a large bowl, break 10 eggs and pour in the coconut milk. Add in the salt and pepper, then whisk everything together until well combined.
Put the cooked sausage into the greased 9x13 pan in an even layer, then spread the cooked leeks and mushrooms evenly over the sausage. Pour the egg mixture into the dish as well. The mixture should cover most of the meat and vegetables.
Place the dish into the oven and cook for 40 to 45 minutes, rotating the pan around halfway through the cooking time, until the egg mixture is set and fully cooked.
Take dish out of the oven and let cool slightly (5-7 minutes) before serving. Add chopped scallions is desired.