Created by breezermom on October 2, 2017
Step 1: Cook the frozen vegetables according to the package directions. Drain well.
Step 2: Combine cooked vegetables, onion, celery, cheese, and mayonnaise in a large bowl, stirring well.
Step 3: Spoon the mixture into a greased 11 x 7 x 1 1/2 inch baking dish.
Step 4: Combine cracker crumbs and butter. Stir well. Sprinkle crumb mixture evenly over the casserole. Bake at 350 degrees for 30 to 35 minutes or until thoroughly heated.