1. Pre-cook broccoli and rice separately. Set aside.
2. In large saucepan, melt 2 Tbsp butter and saute onions and celery. Add both soups and cubed processed cheese; stir until melted. Fold in broccoli and rice.
3. Pour into ungreased 9 x 13" casserole dish and heat uncovered for 30 minutes at 350 degrees.