Pre-heat the oven to 325°F.
Spray 36 mini-muffin cups with non-stick cooking spray.
Heat a large skillet, over medium-high heat, and crumble in sausage; cook and stir until sausage is crumbly and evenly browned; about 10 minutes .
Remove from the heat; drain and discard excess grease.
Sprinkle sausage, Cheddar cheese, Swiss cheese and green onion evenly into the prepared mini-muffin cups.
In a medium bowl, beat eggs, potato flakes and cream together; season with salt and pepper.
Pour egg mixture evenly over the sausage-cheese mixture in the mini-muffin cups.
Place in the pre-heated oven and bake until quiche are set in the middle and lightly browned; about 22 minutes.
Remove from oven and allow to cool for 5 minutes before serving.
