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Ingredients

1. 8 thick slices lean bacon
2. 2 tablespoons unsalted butter
3. 1 tablespoon extra-virgin olive oil, plus more for frying
4. 1 pound white mushrooms, thinly sliced
5. Salt and freshly ground pepper
6. 4 large eggs
7. Twelve 1/4-inch thick slices whole wheat sandwich bread, toasted
8. Mayonnaise
9. 4 romaine lettuce leaves
10. 8 thin tomato slices

Directions

1. In a large, nonstick skillet, cook the bacon over moderate heat, turning once, until crisp, about 4 minutes per side. Drain on paper towels.
2. Wipe out the skillet and melt the butter in 1 tablespoon of olive oil. Add the mushrooms, season with salt and pepper and cover. Cook over moderate heat until the mushrooms soften and release their liquid, about 7 minutes. Uncover and continue to cook over moderate heat, stirring often, until the mushrooms are richly browned, about 8 minutes longer. Transfer the mushrooms to a bowl.
3. Wipe out the skillet and coat it with a thin film of oil. Fry the eggs over-easy over moderate heat, about 3 minutes on the first side and 30 seconds to 1 minute on the second side. Season the eggs with salt and pepper.
4. On a work surface, spread 4 slices of the toast with mayonnaise and top with the lettuce, tomato slices and bacon. Cover with 4 slices of toast, spread them each with mayonnaise and top with the mushrooms and fried eggs. Cover the sandwiches with the remaining toast, cut them in half and serve.