If using dried mushrooms, soften them by covering them with boiling water in a heat-proof bowl for about 30 minutes. Drain well.
Preheat the oven to 375°F (190ºC). Grease a casserole dish or glass baking dish with coconut oil. I used a 10″ round casserole. If you use a smaller one, you may have to bump up the baking time a few minutes since the quiche will be thicker.
In a large skillet over medium heat, render and brown the bacon. Add the leftover chicken, mushrooms and sage to the pan and cook for a few minutes, making sure there is no moisture left from the mushrooms (if not, your quiche will be soggy…no bueno). Dump this mixture into the greased casserole dish, and set aside.
Crack the eggs into a medium bowl. Add the coconut milk, sea salt and pepper. Whisk to combine. Pour the egg mixture into the casserole dish.
Bake the quiche for about 30 minutes or until the center is set and not jiggly.