Chicken Buns

2 c. chicken, cooked and cubed
3/4 c. celery, finely chopped
1 tbsp. onion, finely chopped
1 c. Velveeta cheese, cubed
1/2 c. salad dressing

Mix all ingredients together; put on buns. Wrap in foil and put in oven at 325 degrees for 45 minutes.