Prepare the sandwich. Spread the pesto and sun-dried tomatoes over one slice of bread. Add the turkey, cheese, tomatoes and spinach before topping with the other slice of bread.
Preheat a ridged fry pan or grill pan over medium heat until hot. Spray with cooking spray. Place the panini in the pan and weight down with a second fry pan or a grill press. Cook until the underside is golden, about 2 minutes. Turn the sandwich over, weigh it down again and cook until golden on the other side, about 2 minutes. Cut in half and serve immediately.
Alternatively, you can cook the sandwiches using an electric panini press according to the manufacturer’s instructions.
Notes
To save time, break out this sandwich when you have leftover turkey.
Slice the turkey a little thicker to add some oomph.
Don't leave the sandwich on the pan/grill long or you will burn it. Check every minute or so until you get the nice char marks.
If using a panini press, set to 400°F and press the sandwich for 5 minutes.