Preheat the grill or oven to 350°F.
Prepare the rice according to the package directions.
Meanwhile, cook the sausage in a skillet over medium heat until browned, then drain any excess grease.
In a large mixing bowl, combine the cooked rice, browned sausage, and the remaining ingredients.
Stir until everything is evenly incorporated.
Transfer the mixture to a greased 8×8-inch baking dish and spread into an even layer.
Bake for 1 hour, or until hot and bubbly.
Let the casserole cool for 5-10 minutes before serving.