Slice twelve 1/2-inch slices of bread from the baguette. Place on a baking sheet, and brush generously with the olive oil. Sprinkle a little salt on each slice. Bake for about 10 minutes, or until crisp and slightly golden. Remove from oven and cool slightly.
Top each crostini with half a slice of Swiss cheese and broil for 1-2 minutes until melted.
Add roasted mushrooms, half a slice of London Broil Roast Beef and a sprinkle of fresh thyme.