Spray a 7 inch round baking dish with non-stick spray. See notes.
Add the broccoli to a large microwave safe bowl along with ¼ cup of water. Cover tightly with plastic wrap and microwave for 5 minutes. Let stand, covered, for 3 minutes.
Carefully remove the plastic wrap and drain the liquid.
Add the cream cheese, sour cream, and cheddar to the bowl with the broccoli and stir well to combine.
Pour broccoli mixture into the prepared baking dish. Cover with foil.
Air fry at 350 degrees for 10 minutes.
Stir together the cracker crumbs and melted butter.
Remove the foil and top the casserole with the cracker crumbs.
Return the pan to the air fryer and cook, uncovered, for 5 minutes.
