01 -
Heat a skillet or griddle over medium heat until ready to toast bread evenly without burning.
02 -
Spread softened butter evenly on one side of each bread slice to promote browning and add richness.
03 -
Combine ricotta, mozzarella, and Parmesan cheeses in a bowl until thoroughly mixed for a creamy blend.
04 -
Place two slices of bread buttered side down on the skillet. Evenly spread the cheese mixture on each, then layer with sun-dried tomatoes and fresh spinach leaves. Top with remaining slices, buttered side up.
05 -
Cook for 3 to 4 minutes per side until bread is golden and crisp and cheese is fully melted. Avoid flipping too soon to prevent disassembly.
06 -
Remove from skillet, let rest briefly to settle cheese, then cut sandwiches in half before serving.