Preheat your oven to 375°F (190°C).
Grease a 9x13-inch baking dish or a medium casserole dish with a little butter or oil.
In a large bowl, combine cream cheese, sour cream, and mayonnaise. Mix until smooth. If the cream cheese is too firm, microwave the mixture for 15–20 seconds to soften.
Add garlic, onion powder, smoked paprika, Italian seasoning, red pepper flakes (if using), salt, and black pepper.
Stir until evenly blended.
Fold in 1/2 cup cheddar, mozzarella, and Parmesan. The mixture will be thick. If it feels too stiff, add 1–2 tablespoons of chicken broth to loosen it slightly.
Add the shredded or diced chicken to the bowl.
Toss until every piece is coated with the creamy sauce.
Spread the chicken mixture evenly in the prepared baking dish. Sprinkle the remaining 1/2 cup cheddar over the top.
In a small bowl, mix almond flour, crushed pork rinds, and melted butter. Stir until it forms a crumbly topping.
Sprinkle the topping evenly over the casserole.
Press lightly so it adheres.
Bake for 22–28 minutes, until the edges are bubbling and the topping is golden brown. If you like extra color, broil for 1–2 minutes at the end, watching closely.
Let it rest for 5–10 minutes before serving. Garnish with chopped parsley if you like.