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1
Heat olive oil and 2 tablespoons butter in a large skillet over medium heat.
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2
Add sliced onion, cook until soft.
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3
Once the onions are soft, remove to a bowl and set aside.
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4
Sprinkle chicken breast halves with salt and pepper on each side.
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5
Turn heat up to medium-high, and add chicken.
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6
Let the chicken sear on both sides.
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7
Reduce heat to medium-low.
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8
Add the white wine to the pan, scraping the bottom to loosen the seared bits and stirring them into the sauce.
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9
Return the onion slices to the pan and simmer until the chicken is cooked through, about 5 minutes.
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10
Meanwhile, split the rolls in half and spread 1/2 tablespoon softened butter on each half.
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11
Sprinkle with rosemary and top with the parmesan cheese.
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12
Lay the rolls, cheese side up, on a baking sheet.
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13
Put the rolls under the broiler for about 5 minutes, watching carefully, until the cheese is melted, bubbly, and beginning to brown.
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14
Dont let them cook too long; they will burn quickly!
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15
Assemble the sandwiches.
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16
Place a chicken breast half on the bottom half of a roll.
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17
Top with onions and wine sauce, and then with fresh spinach.
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18
Press the top half of the roll on top, and repeat with the rest of the sandwiches.
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19
Serve immediately!
