Preheat the oven to 375°F. Lightly spray the muffin cups with cooking spray.
Cooking Spray
Chop mix-ins coarsely and set aside.
Mix-Ins
In a medium bowl, whisk together eggs, milk, half & half, salt, and pepper.
8 large Eggs, 2/3 c. Whole Milk, 2/3 c. Half & Half, 1 tsp Salt, 1/2 tsp Black Pepper, Various Spices & Seasonings
Add a small amount of the mix-ins and a bit of cheese to each of the cups. Pour the egg mixture over the cheese and mix-ins until the cups are about 2/3 full. Sprinkle a bit more mix-ins and cheese to the top of each quiche.
3/4 c. Cheese
Bake until the tops are puffed and just beginning to brown (about 15 minutes).
Enjoy while still hot.
Notes
The calorie count is for quiches without mix-ins.The quiches can stay in the refrigerator for up to 4 days. They can be frozen for up to 1 month.