Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13 inch baking dish.
Heat the olive oil in a skillet over medium heat. Add the garlic and onion and cook until the onion is softened and transparent, about 5 minutes. Add the cooked rice and broccoli and stir to combine.
Spread the broccoli mixture into the prepared baking dish. Sprinkle with the shredded cheese and breadcrumbs. Bake for 20 minutes, or until the cheese is melted and bubbly.
Serve hot.
Interesting Facts
This recipe is great to make ahead and freeze. Just assemble the casserole and freeze before baking. When ready to eat, thaw and bake as directed.
You can substitute other vegetables in this recipe, such as cauliflower, carrots, or zucchini.
To save time, you can use pre-cooked and frozen rice and broccoli.