Preheat your oven to 375°F so the casserole cooks evenly. Lightly grease a baking dish to prevent sticking and make cleanup easier. I usually use a ceramic dish because it keeps the casserole warm longer.
In a large bowl, combine the softened cream cheese, buffalo sauce, and ranch dressing. Stir everything until the mixture becomes smooth and creamy. This step helps distribute the spicy flavor evenly throughout the casserole.
Add the shredded chicken, cauliflower rice, garlic powder, onion powder, smoked paprika, salt, and pepper. Mix everything thoroughly so the chicken gets coated in the creamy buffalo sauce. The seasoning gives the casserole a deeper savory flavor.
Fold in most of the shredded cheddar cheese and sliced jalapeños. Reserve a little cheese for the top because it creates a golden cheesy crust while baking. Fresh jalapeños give the casserole a bright spicy kick.
Spread the mixture evenly into the prepared baking dish. Smooth the top using a spatula so the casserole cooks evenly. Sprinkle the remaining cheese over the top for a rich cheesy finish.
Place the casserole in the oven and bake for about 25 to 30 minutes. The cheese should melt completely and the edges should become slightly bubbly. I like to broil it for 2 minutes at the end for extra golden cheese.
Remove the casserole carefully from the oven and let it cool for a few minutes. Top with green onions, extra jalapeños, or crumbled bacon before serving. The garnish adds freshness, crunch, and extra flavor.