Gently warm turkey meat in a skillet set over medium low heat, just until heated, not browned.
Butter outside of two pieces of sliced bread.
Assemble bread, turkey, strips of bacon, and cheese into a sandwich.
Toast the exterior of the panini in the skillet, buttered side down, until it starts to brown.
Flip the panini over and toast the other side as well.
Remove from pan once both sides are toasted and the cheese has melted.
Open up the sandwich and add spinach, tomato and Caesar dressing.
Slice in half and serve.
Notes
If you want it exactly like Panera, don't cook the sandwich like a panini. However, I think you will find it tastes much better as a panini. I also enjoy substituting smoked turkey and smoked Gouda for the regular turkey and Gouda.