Lasagna Sandwiches

1/8 cup sour cream
1 tablespoon chopped onion
1/4 teaspoon oregano
4 slices Italian or other white bread
4 bacon strips, halved and cooked
4 slices tomato
2 (wide) slices Mozzarella cheese
2 tablespoons butter or margarine
Combine first 3 ingredients; spread on four slices of bread. Top each with four bacon pieces, two tomato slices, and a slice of cheese. Top with remaining bread.
In a skillet over medium heat, melt 2 tablespoons butter. Cook sandwiches on both sides until bread is lightly browned and cheese is melted, adding more butter if necessary.
Makes 2 servings.