Broccoli Rice Bake

Ingredients

• 1 cup chopped celery
• 1 medium onion, chopped
• 1/4 cup butter, cubed
• 1 can (10-3/4 ounces) condensed cream of celery soup, undiluted
• 1 can (10-3/4 ounces) condensed cream of mushroom soup, undiluted
• 1 cup process cheese sauce
• 1 cup uncooked quick-cooking rice
• 1 can (4 ounces) mushroom stems and pieces, drained and chopped
• 2 packages (10 ounces each) frozen broccoli cuts, cooked and drained