In a saucepan, over medium heat, melt the butter.

Once the butter is melted, add the flour and whisk until it is completely combined allowing the flour to cook for about one minute. 

Slowly stir in the half and half along with two teaspoons of  your
choice of  seasoning.

Once the sauce has started to thicken, add the mozzarella cheese and Parmesan cheese.

Stir until combined and the cheese begins to melt and the sauce thickens.

Keep the sauce warm while you slice the zucchini into rounds.

Place the zucchini rounds in the bottom of a 9X13 baking dish that's been sprayed with non-stick cooking spray.

Spoon the cheese sauce on top making sure you cover as much of the zucchini
slices as possible.

Sprinkle the crushed Ritz crackers on top.

Bake in a preheated 375 degree oven for 20 to 25 minutes or until the casserole is bubbly and the cracker topping is slightly browned.