Preheat the oven to 350 degrees F (175 degrees C).

Combine broccoli and 1/2 cup water in a saucepan over medium heat. Cover and cook until tender, about 10 minutes. Drain.

Transfer broccoli to a 9x13-inch casserole dish. Add chicken, condensed soup, cottage cheese, Cheddar cheese, salad dressing, and lemon juice and mix until well combined.

Mix crushed crackers and melted butter together; sprinkle over the casserole.

Bake in the preheated oven for about 30 minutes.