Preheat your oven to 375°F (191°C). Prepare your vegetables depending on what you’re using: thaw frozen spinach completely and squeeze out excess water, or boil fresh broccoli for 1–2 minutes until bright green and drain well.

In a large bowl, combine the chicken, chopped cooked bacon, prepared vegetables, minced garlic, ranch dressing, and both cheeses. For extra flavor, you can stir in 1–3 teaspoons of ranch seasoning. To save dishes, everything can also be mixed directly in the casserole dish.

Pour the mixture into a 9×13-inch (23×33 cm) casserole dish and spread it evenly. Sprinkle the remaining ½ cup mozzarella and ½ cup cheddar evenly on top to create a golden, bubbly layer when baked.

Bake for about 15 minutes, or until the cheese is melted and the casserole is heated through. If the top starts browning too quickly, cover loosely with foil. Let it cool slightly, then serve warm for a comforting, cheesy meal.