What tops the chili served at Texas Roadhouse?

The chili served at Texas Roadhouse is topped with red onions and cheddar cheese. This combination enhances the flavor and texture of the chili, as the sharpness of the cheddar cheese complements the rich and hearty taste of the chili itself. Additionally, red onions add a mild sweetness and crunch, balancing the dish and making it more enjoyable. This specific topping is a signature aspect of Texas Roadhouse's chili preparation and contributes to the overall experience of the dish.

The other options, while they include common toppings that might be seen in different chili recipes, do not align with the Texas Roadhouse specifications. Therefore, red onions and cheddar cheese are the definitive topping combination for their chili.