01 -
Bring butter and cream cheese to room temperature for easy spreading. Butter one side of each sourdough slice.
02 -
Flip bread slices and evenly spread a generous layer of cream cheese on the unbuttered sides.
03 -
Spoon blueberry preserves over the cream cheese on one slice, keeping them thick or gently swirling if desired.
04 -
Layer shredded mozzarella and sharp cheddar atop the preserves to ensure a balanced melt and flavor.
05 -
Assemble sandwich, place in a medium-heat skillet, and cook 3 to 4 minutes per side until bread is golden and cheeses are melted. Press gently with a spatula.
06 -
Let sandwich rest briefly to allow cheeses to set, then slice diagonally and serve warm.