Prepare the Rice: Cook the Rice-A-Roni Spanish Rice according to the package instructions. Once done, set aside.
Cook the Meat & Veggies: In a large skillet, brown the ground beef over medium heat. Once browned, add the chopped onion, red bell pepper, and green bell pepper, cooking until the veggies are softened, about 5-7 minutes.
Season & Combine: Stir in the can of Rotel, along with salt, pepper, and cumin to taste. Add a sprinkle of cheddar cheese, creating that tempting gooeyness.
Assemble & Bake: In a greased baking dish, combine the prepared rice and the meat mixture. Top it all off with the remaining shredded cheese for that melty goodness.
Bake: Bake in a preheated oven at 350°F (175°C) for 25-30 minutes, or until the cheese is melted and bubbly, forming a gorgeous golden crust.
Serve & Enjoy: Let the dish cool slightly before serving to avoid burns. You'll find that this hearty casserole is great for leftovers, as it reheats beautifully!