Turn on the oven broiler. Drizzle olive oil over the top of the baguette slices and toast just until browned. About 2 minutes.
In a food processor combine avocado, garlic powder, salt, sour cream, Worcestershire and lime juice. Pulse until smooth.
Place the toasted bread on a serving platter. Spread a generous portion of the avocado cream on top of each piece of bread and top with tomato slices. Serve.