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1
Preheat an oven to 400 F.
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2
Cut off the top of the head of garlic to expose the cloves, trimming about 1/4 inch off of the top of each clove.
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3
Drizzle the cut cloves with olive oil, then wrap in a piece of aluminum foil.
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4
Place in the preheated oven and bake until the cloves are tender, about 35 minutes.
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5
Remove garlic from oven and set it aside but do not turn oven off.
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6
Once its cooled a little, squeeze garlic out of the cloves into a small dish; mash into a paste.
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7
Season chicken breast halves with salt and pepper.
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8
In a medium pan, melt 2 tablespoons of butter over medium heat.
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9
Once butter has turned slightly golden in color, place the chicken into the pan.
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10
Do not move it, and cook for 3-4 minutes on each side.
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11
Meanwhile spread the remaining tablespoon of butter on the cut sides of the bread, sprinkle with rosemary, and place on a baking sheet.
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12
Toast bread in the preheated oven for 5 minutes.
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13
Remove from oven and spread with the garlic paste.
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14
Remove chicken from pan, and set aside.
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15
Top the bottom half of the sliced ciabatta with basil, tomatoes, chicken and mozzarella.
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16
Drizzle with balsamic vinegar.
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17
Return sandwich halves to the baking sheet.
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18
Place in the hot oven and cook until the cheese has melted, about 10 minutes.
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19
Remove pan from oven and set aside.
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20
Allow sandwich to cool slightly before topping with the top half of the bread.
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21
Cut each sandwich in half and serve.
