A taco bar is a versatile and interactive option for a kids' birthday dinner. Set up a buffet-style spread with a variety of taco fillings and toppings. Offer options like seasoned ground beef, shredded chicken, and vegetarian fillings like black beans or grilled vegetables. Provide a selection of toppings such as shredded cheese, lettuce, tomatoes, salsa, guacamole, and sour cream. Let the kids build their own tacos according to their preferences. It's a fun and customizable meal that will please even the pickiest eaters.