Open sour cream container and stir then add onion powder to container and mix to combine. Spoon the mixture onto the bottom of a shallow serving/baking dish and reserve.
Heat bacon as directed on package then crumble it on top of sour cream mixture. Next, top the sour cream with shredded cheese, 3/4 cup of the tomato and all of the lettuce. Top with remaining tomato. Serve with your favorite tortilla chips.