Preheat oven to 356°F (180°C)
In a bowl, whisk eggs with a pinch of salt and pepper.
Chop the garlic, onion, red bell pepper, and sausage into small pieces. Cut the cherry tomatoes into 4 pieces each.
Arrange the chopped garlic, onion, and red bell pepper in the cup. Add spinach and cherry tomatoes on top of the vegetable mixture. Pour in the whisked egg mixture, then sprinkle them with parmesan cheese and sausage.
Bake egg muffin for 25 minutes.
Best served while the egg muffins are still warm. Enjoy!