Steam the bao buns over boiling water for about 7 minutes, until softened. If you don't have a steamer, you can use a strainer over a pot, covered with a lid. Don't leave them in too long, or they will become too soft.
Pour the tomato sauce into a small saucepan, add salt, pepper, and a little oregano. Heat over medium heat for about 5 minutes to allow the flavors to meld. Do not boil, just let it simmer gently.
Grate the mozzarella so it can be evenly distributed into the buns. Tip: if the cheese is too watery, dab it lightly with paper towels to prevent it from soaking the dough.
When the bao buns are ready, carefully open them, being careful not to tear them. Spoon in a little tomato sauce, sprinkle with grated mozzarella, then sprinkle with a pinch of oregano.
Place the filled buns on a baking sheet and bake in a preheated oven at 350°F (180°C) for 5–7 minutes, until the cheese is melted and lightly golden brown. Watch out not to dry out the buns!
Before serving, drizzle with a little olive oil and eat immediately while the cheese is still gooey. Simple, quick, and perfect as a filling snack or party food!
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