Baked Tahong, SIMPOL!

Try this cheesy and budget-friendly appetizer!
Serves 3 to 4.
Ingredients:
Set A:
2 cloves garlic, minced
1 tablespoon butter
1 can evaporated milk (370ml)
½ cup grated quickmelt cheese or 2 red eggs chopped finely with 1 tablespoon cornstarch
Set B:
½ kilo tahong (mussels), cleaned
Chopped spring onions