Heat the oven: Preheat to 350°F (175°C).
Lightly grease a 9x13-inch baking dish with nonstick spray.
Blend the creamy base: In a large bowl, mix cream cheese, sour cream, cream of chicken soup, and mayonnaise until smooth. A hand mixer makes this quick, but a sturdy whisk works too.
Season it up: Stir in garlic powder, onion powder, salt, pepper, and lemon juice if using. Fold in the shredded cheddar.
Add the chicken: Gently fold the chicken into the creamy mixture until everything is evenly coated.
Mix in bacon and herbs if you’re using them.
Spread in the dish: Transfer the mixture to the prepared baking dish and smooth the top with a spatula.
Make the topping: In a small bowl, combine crushed crackers with melted butter. Stir until the crumbs are evenly moistened.
Top and bake: Sprinkle the buttery crumbs over the casserole. Bake for 25–30 minutes, until the edges are bubbling and the topping is golden brown.
Rest and serve: Let the casserole sit for 5–10 minutes before serving so it sets slightly.
Garnish with extra herbs, if you like.