rice-a-Roni Supreme * 1 Box Beef rice-a-Roni * 1 Pound Hamburger * 1 Pint sour cream * 1/2 Pound Fresh Mushrooms, Sliced * 1 Medium Onion, Diced Brown Hamburger; Drain. brown rice-a-Roni According to Package Directions. Add Seasoning Packet, water, Hamburger, onions And Mushrooms. Continue Cooking According to Package Directions. After Mixture is Cooked Remove From Stove And Stir in sour cream. Tina Owner of Creative Cutie Recipes. Come Join Us!