1️⃣ Preheat Oven: Preheat to 375°F (190°C).
2️⃣ Cook Bacon: If using raw, cook until crispy and chop.
3️⃣ Make Sauce: Melt butter in a saucepan. Stir in flour, then gradually whisk in milk until thickened. Remove from heat and mix in ranch dressing, salt, and pepper.
4️⃣ Combine Ingredients: In a bowl, mix chicken, bacon, and half of the cheese. Pour in the ranch sauce and stir.
5️⃣ Layer Tater Tots: In a greased 9×13-inch baking dish, spread tater tots, then top with chicken mixture.
6️⃣ Add Cheese: Sprinkle remaining cheese on top.
7️⃣ Bake: Bake for 30-35 minutes until bubbly and golden brown.
8️⃣ Serve: Let cool slightly before serving.
