Preheat the oven to 200°C. Grease muffin tin with oil.
Cut the crusts off the slices of bread. One at a time, place each slice over a muffin hole and gently press the bread to form a cup (if the bread breaks up, it is okay, just stick it back in the torn place).
Brush each bread cup with oil. Fill each cup with a spoonful of pizza sauce, some grated cheese, sprinkle over the crispy bacon and fresh oregano (if using).
Bake for 5–6 minutes or until the cheese has melted. Let them cool in the tin for a while before you remove.
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