This recipe is great because you can add in whatever ingredients you like and have on hand. I would suggest using this as sort of a base recipe to modify however you like. This is from The Primal Blueprint Cookbook.
Makes 6 muffins
Ingredients:
6 eggs
1/4 lb cooked ground beef/sausage
1 red pepper, finely chopped
1/4 c grated cheese
Salt and pepper to taste
Butter/coconut oil
1. Preheat oven to 350 F. Grease 6 muffin tins or paper baking cups with butter/coconut oil.
2. In a bowl, beat the eggs. Add meat, red pepper, cheese and seasoning.
3. Spoon into muffin tins and bake 18-20 minutes.
Just a side note that if you add in mushrooms, like I did, or other veggies like spinach that release water, the muffins tend to fall apart.