Preheat Oven To 350 Degrees F (175 Degrees C). Place Walnuts On Small Baking Sheet, And Bake For 6 To 8 Minutes Or Until Toasted. Melt Butter In A Medium Saucepan Over Medium Heat. Cook Onion And Garlic In Melted Butter For 3 Minutes, Stirring Frequently. Stir In The Rice, Add The Broth, And Bring To A Boil. Reduce Heat To Medium-Low. Cover, And Simmer Until Liquid Is Absorbed, About 7 To 8 Minutes. Place Broccoli In A Microwave-Safe Casserole Dish, And Sprinkle With Salt And Pepper. Cover, And Microwave Until Tender. Spoon Rice Onto A Serving Platter, And Top With Broccoli. Sprinkle Walnuts And Cheese On Top.