01 -
In a large skillet over medium heat, cook ground beef until browned and cooked through, about 5 to 7 minutes, breaking apart with a spatula. Drain excess grease.
02 -
Reduce heat to low, stir in 1 cup marinara sauce, and simmer for 2 to 3 minutes until heated through. Remove from heat.
03 -
In a medium bowl, combine ricotta cheese, grated Parmesan, and Italian seasoning. Mix until smooth.
04 -
Spread 0.5 tablespoon softened butter evenly on one side of each bread slice.
05 -
On the unbuttered side of four bread slices, spread 2 tablespoons ricotta mixture, layer with about 0.33 cup ground beef mixture, then top with 0.25 cup shredded mozzarella. Repeat for all four sandwiches.
06 -
Place the remaining bread slices over each assembled sandwich with the buttered side facing up.
07 -
Heat a large skillet over medium heat. Cook sandwiches for 3 to 4 minutes per side until bread is golden brown and cheese is melted, working in batches if necessary.
08 -
Serve immediately with remaining marinara sauce for dipping.