Broccoli and Cauliflower Casserole

12 oz. pkg. frozen broccoli and cauliflower, thawed 1 small onion, chopped 10.5 oz. can cream of mushroom soup (cream of celery will work also if you do not like cream of mushroom) 2 large eggs, beaten 1/2 C. mayo 1 C. grated sharp cheddar cheese 1/4 tsp. pepper 1/4 tsp. powdered mustard 20 crushed buttery round crackers Take the thawed broccoli and cauliflower and chop it into smaller pieces and place in a bowl. Add the remaining ingredients and stir together to combine well. Pour into a 2 quart, buttered, baking dish and bake, uncovered, in a 350 degree oven for 1 hour.