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Step 1
Preheat the oven to 375º F and adjust the rack to the middle position. In a medium-size bowl, combine the mozzarella, butter, mayo, garlic, sea salt and olives. Stir to combine.
Step 2
Using a spatula, spread the cheese mixture evenly on each half of sourdough and place cheese-side up on a baking sheet. Bake for 20 minutes, or until just turning golden brown on top. Sprinkle with parsley and serve warm.