broccoli casserole recipe

4 cups fresh broccoli florets (or 2 packages frozen broccoli, thawed and drained) 1 can (10.75 ounces) condensed cream of mushroom soup 1 cup shredded cheddar cheese 1/2 cup mayonnaise 1/4 cup milk 2 large eggs, beaten 1 small onion, finely chopped 1/4 teaspoon salt 1/4 teaspoon black pepper 1 cup crushed crackers (like Ritz)