Follow these steps to create delicious Sausage, Spinach & Mushroom Egg Bites:

1. Preheat the Oven: Set your oven to 350°F (175°C) and grease a muffin tin with cooking spray or olive oil.
2. Cook the Sausage: In a skillet over medium heat, cook the crumbled sausage until browned. Remove and set aside.
3. Sauté Vegetables: In the same skillet, add the diced mushrooms, cooking until soft. Add the chopped spinach and cook until wilted. Remove from heat and set aside to cool slightly.
4. Combine Ingredients: In a large bowl, whisk together the eggs, milk, garlic powder, salt, and black pepper until well combined.
5. Add Filling: Stir in the cooked sausage, sautéed mushrooms, spinach, and shredded cheese into the egg mixture.
6. Fill Muffin Tin: Pour the mixture evenly into the greased muffin tin, filling each compartment about three-quarters full.
7. Bake: Place in the preheated oven and bake for 20-25 minutes, or until the egg bites are set and lightly golden on top.
8. Cool and Remove: Let the egg bites cool in the tin for a few minutes before using a knife to gently loosen and remove them.
9. Store: Enjoy immediately or store the extra bites in an airtight container in the refrigerator.

These simple steps will help you achieve incredible flavor and great texture in your breakfast bites.