01 -
Heat a skillet or griddle over medium heat to prepare for even toasting without burning the bread.
02 -
Evenly spread softened butter on one side of each bread slice to achieve a golden, crisp crust.
03 -
Combine ricotta, mozzarella, and Parmesan cheese in a bowl until thoroughly blended for a creamy texture.
04 -
Place two bread slices buttered side down on skillet. Spread cheese mixture evenly over them, top with sun-dried tomatoes and fresh spinach leaves, then cover with remaining bread slices buttered side up.
05 -
Cook each sandwich for 3 to 4 minutes per side, allowing bread to become golden and cheese to melt fully without flipping prematurely.
06 -
Remove sandwiches from skillet and let rest briefly before slicing to allow cheese to settle.