Grab-and-Go Veggie Egg Muffins

Name: Grab-and-Go Veggie Egg Muffins
Prep time: 5 min
Cook time: 20 min
Total time: 25 min
Ingredients: 6 medium eggs; 1/2 portobello mushroom; 2 spring onions; 1/2 red bell pepper; 1/2 yellow bell pepper; 1 tbsp olive oil; A pinch of salt; A pinch of black pepper; 1/2 tsp garlic powder; 50ml skimmed milk; 1 tsp dried parsley; Grated cheddar cheese to top ((optional))