I saw this on Cooking Light’s website; I just added some mozzarella cheese and some pasta sauce to jazz it up a bit.
4 Italian sausage links, cut in half crosswise
4 cups baby spinach
4 (1 1/2-ounce) French bread rolls
1 cup mozzarella cheese, shredded
Coat a large nonstick skillet with cooking spray, and place over medium heat until hot. Add sausages, and cook 10 minutes, turning occasionally.
Remove sausage from skillet; carefully slice each piece in half lengthwise, cutting to, but not through, other side. Open the halves, laying sausage flat. Return sausage to skillet, placing cut sides down; cook 2 minutes or until sausage is done. Remove sausage from skillet; set aside, and keep warm. Add spinach to skillet; cover and cook 2 minutes or until wilted. Remove spinach from skillet; set aside, and keep warm.
Slice each French bread roll in half horizontally. Fill with one sausage, 1/4 of the spinach and 1/4 of the mozzarella cheese.
If you have a panini maker, use it. If not, heat a skillet over medium low heat and spray with cooking spray. Place sandwich in skillet and put a heavy skillet on top of it for a few minutes. Flip the sandwich over, place the skillet on top of it again and cook for a few minutes on that side until cheese is melted.
Serve with heated up pasta sauce in little bowls for dipping your sandwich into.