Preheat your oven to 375°F / 190°C.
Place the rice, beans, salsa, avocado oil, broccoli florets, cumin, paprika if using, garlic powder, and broth into a 9 x 13-inch / 24 x 36cm baking dish. Stir well. Cover the baking dish tightly with foil. Transfer the dish to the oven and bake for 1 hour.
Remove the baking dish from the oven. Set the broiler to high. Arrange the thin tomato slices in a layer on top of the baked rice and beans.
Place the casserole under the broiler for 3-5 minutes, or until the tomatoes are a bit shrunken and appear cooked.
Drizzle the casserole in a zigzag pattern with the cashew queso sauce. Finish topping it with fresh, chopped cilantro or parsley leaves. Cut the casserole into slices and serve with additional queso sauce tableside.
The casserole will keep in an airtight container in the fridge for up to 6 days and can be frozen for up to 6 weeks.