Dinner

Combine sour cream, chopped onion, dried oregano and salt in a small bowl
Spread the mixture on four slices of bread
Layer bacon, tomato and mozzarella on the prepared slices and top with the remaining bread
Melt 2 tablespoons butter in a large skillet or griddle
Toast sandwiches in the skillet until lightly browned on both sides and cheese melts, adding butter if necessary