1. Preheat oven to 375°F.
2. While the oven heats, cook the onion in the oil for 3 to 5 minutes, until translucent and fragrant.
3. Once cooked, remove the onions from heat and set aside.
4. Spray a muffin tin with non-stick cooking spray, and fill 10 muffin holes with the sautéed onions and uncooked broccoli chunks, equally.
5. In a large bowl, whisk all the eggs together with the milk, salt, pepper, and garlic powder.
6. Pour the seasoned egg mixture into the 10 muffin holes with the vegetables.
7. Sprinkle the cheese evenly over the 10 filled muffin holes.
8. Place the muffin tin in the oven and let cook for 15 to 20 minutes, until the eggs are set and the cheese has melted.
9. Once cooked, remove the muffin tin from the oven and let cool.
10. Once the egg bites are cooled, store them in air-tight containers, 2 broccoli egg bites per container, and place them in the fridge.
11. When you're ready to enjoy the egg bites, microwave them for 1 to 2 minutes, then serve, and enjoy!