Preheat oven 350 F. Lightly coat a 12 muffin pan with cooking spray and set aside. Heat a large skillet over medium heat. Add oil. Then add garlic and onion. Sautée for up to 30 seconds. Put in sausage and cook for several minutes until sausage is done. Remove pan from heat.

Crack eggs into a large bowl and season with salt and pepper. Whisk together to beat eggs. Transfer egg mix to a cup (I like to use a large measuring cup with a spout). Place red bell pepper, spinach, and  the sausage, garlic, and onion mix evenly into each muffin cup. (I like leave some chopped red bell pepper for the end).

Pour egg mixture evenly into each muffin cup till about ¾ full. Sprinkle the remaining bell peppers on top. Bake for 20-25 minutes or until egg muffins are set. Use toothpick to check for doneness. If it comes out clean, it’s ready!