Preheat oven 375° F.Melt butter in saucepan on low heat. Remove from heat, blend in rice flour and salt. Add milk, heat stirring constantly until sauce thickens a little and is smooth. Add cheeses, heat until melted, stirring occasionallyCombine cooked macaroni, sauce, peas and ham in a 9” x 13” oven safe casserole dish.Bake for 20 minutes or until heated through.