Cheesy Macaroni-Mushroom Bake - cooking recipe

Ingredients

1 (8 oz.) pkg. elbow macaroni
1 (10 3/4 oz.) can cream of celery soup (undiluted)
1 c. milk
1/2 c. chopped onion
1 tsp. salt
1/4 tsp. pepper
1/4 tsp. ground oregano
2 c. shredded Cheddar cheese (8 oz.)
1 (3 oz.) can sliced mushrooms, drained and divided
3 Tbsp. grated Parmesan cheese
2 small tomatoes, cut into wedges

Preparation

Cook macaroni according to package directions; drain.
Rinse macaroni and set aside.