
Cook broccoli and rice according to package directions.
Preheat oven to 350 degrees F (175 degrees C).
Melt butter in a large skillet over medium-high heat, and saute celery and onion until soft.
Melt the American cheese into the celery and onions.
Pour all the remaining ingredients into the skillet and heat through.
Pour into a baking dish and top with the sharp cheddar cheese.
Bake in the preheated oven for 45 minutes, until bubbly and lightly brown.
Serve and enjoy!
https://allrecipes.com/recipe/broccoli-rice-casserole/