This is a simple way to serve a quantity of tacos, and they taste better done this way, too.
Spoon the taco meat mixture into the taco shells and place into a 9 x 13 inch baking dish, standing up. Sprinkle cheese over the top of the taco meat in each shell. Place into the oven and bake at 400 degrees for 10-12 minutes or until the cheese has melted and the tacos are heated through. Remove from the oven and top with any optional condiments for serving.
source: Blog Chef