Classic Italian Panini with Prosciutto and Fresh Mozzarella

Hollow out top and bottom halves of bread, leaving a 1/2-inch-thick shell; reserve torn bread for another use.

Spread 2 tablespoons mayonnaise over cut side of each bread half.

Sprinkle basil and 1/2 cup cheese on bottom half of loaf. Top evenly with prosciutto, tomato slices, and remaining 1/2 cup cheese. Cover with top half of loaf.

Cut filled loaf crosswise into 4 equal pieces.

Heat a grill pan over medium heat. Coat pan with cooking spray.

Add sandwiches to pan.

Place a cast-iron or other heavy skillet on top of sandwiches; press gently to flatten sandwiches. Cook 3 minutes on each side or until bread is toasted (leave cast-iron skillet on sandwiches while they cook).