Heat the oven to 375 degrees. Place the baguette slices on a large cookie sheet; brush the tops with the oil. Bake for 8 to 10 minutes or until golden brown and crisp. Cool. Meanwhile, combine the avocados, lime juice and garlic in a medium bowl. Mix thoroughly, mashing the avocado. Fold in the sour cream. Spoon the avocado mixture onto the baguette slices. Top with diced tomato and sliced fresh basil.