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A warm Vidalia Onion and Rice Casserole in a glass baking dish, featuring golden cheese, sliced onions, and a crumb topping.
Reda

Sweet and Savory Vidalia Onion and Rice Casserole

A comforting and incredibly flavorful Vidalia Onion and Rice Casserole, featuring caramelized sweet onions, creamy rice, and rich Gruyère cheese baked to golden perfection. An ideal side dish or light main course.
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Prep Time 25 minutes
Cook Time 50 minutes
Total Time 1 hour 15 minutes
Servings: 8 servings
Course: Main Course, Side Dish
Cuisine: American, Southern
Calories: 380
Ingredients Equipment Method Notes

Ingredients
  

For the Rice
  • 1 cup long-grain white rice uncooked
  • 2 cups water or chicken/vegetable broth
  • 1/2 tsp salt
For the Vidalia Onion Base
  • 3 lbs Vidalia onions about 3-4 large, thinly sliced
  • 4 tbsp unsalted butter
  • 1 clove garlic minced
  • 1 tsp fresh thyme chopped (or 1/2 tsp dried)
  • 1/2 tsp salt
  • 1/4 tsp black pepper
For the Creamy Sauce & Cheese
  • 1 cup heavy cream
  • 1/2 cup chicken or vegetable broth
  • 1 tsp Dijon mustard optional, for depth of flavor
  • 1.5 cups Gruyère cheese shredded, divided (or sharp white cheddar)
For the Topping (Optional)
  • 1/4 cup panko breadcrumbs
  • 1 tbsp unsalted butter melted

Equipment

  • 2-quart baking dish
  • Large skillet
  • Medium pot
  • Large Mixing Bowl
  • Cutting board
  • Sharp knife

Method
 

Prepare the Rice
  1. In a medium pot, combine 1 cup of uncooked rice with 2 cups of water or broth and 1/2 teaspoon of salt. Bring to a boil, then reduce heat to low, cover, and simmer for 15-20 minutes or until all liquid is absorbed and rice is tender. Fluff with a fork and set aside.
Caramelize the Vidalia Onions
  1. Melt 4 tablespoons of unsalted butter in a large skillet over medium-low heat. Add the thinly sliced Vidalia onions, 1/2 teaspoon of salt, and 1/4 teaspoon of black pepper. Cook slowly, stirring occasionally, for 20-25 minutes, or until the onions are deeply golden brown, very soft, and sweet. If they start to stick, add a tablespoon of water to deglaze the pan. In the last 2 minutes of cooking, stir in the minced garlic and fresh thyme.
Assemble and Bake the Casserole
  1. Preheat your oven to 375°F (190°C). Lightly grease a 2-quart baking dish.
  2. In a large mixing bowl, combine the cooked rice, caramelized Vidalia onions, heavy cream, chicken/vegetable broth, and Dijon mustard (if using). Stir well to ensure everything is evenly distributed.
  3. Add 1 cup of the shredded Gruyère cheese to the mixture and stir until just combined.
  4. Transfer the entire mixture into the prepared baking dish, spreading it evenly.
  5. Sprinkle the remaining 1/2 cup of shredded Gruyère cheese over the top of the casserole. For an extra crispy topping, combine the panko breadcrumbs with 1 tablespoon of melted butter and sprinkle evenly over the cheese.
  6. Bake for 25-30 minutes, or until the casserole is bubbly around the edges and the cheese and topping are golden brown. If the top browns too quickly, you can loosely cover it with foil.
  7. Remove from the oven and let the casserole rest for 5-10 minutes before serving. This allows it to set slightly, making it easier to serve.

Notes

Vidalia onions are key for their sweetness; do not rush the caramelization process as this develops the main flavor. For a lighter version, you can use half-and-half instead of heavy cream, but the casserole will be less rich. Leftovers can be stored in an airtight container in the refrigerator for up to 3 days and reheated gently in the oven or microwave.