A yummy warm sandwich served by itself with lunch or with soup for dinner! This meal can also be easily adjusted to suit your individual tastes and lifestyles.
Preheat panini press and lightly oil the grates.
Place a slice of provolone cheese on both top and bottom pieces of ciabatta bread. Layer 3 slices pancetta and 1/4 cup spinach over the 4 bottom slices of bread. Divide tomato, bell peppers, and onion equally among the sandwiches. Drizzle each sandwich with about 1 teaspoon each olive oil and vinegar; season with salt and pepper. Replace tops of ciabatta rolls and brush with the remaining olive oil.
Place sandwiches on the panini grill; close the press tightly on top. Cook until golden brown and cheese is melted, about 5 minutes.
Per Serving: 661 calories; protein 31.5g; carbohydrates 37.7g; fat 42.6g; cholesterol 69.4mg; sodium 1699.6mg.