Preheat Oven:
Preheat oven to 375°F (190°C).

Mix Chicken:
In a bowl, combine shredded chicken and buffalo wing sauce.

Prepare Cheese Mixture:
In another bowl, mix ricotta cheese, ranch dressing, garlic powder, salt, and pepper until smooth.

Assemble Lasagna:
Spread a thin layer of the ricotta mixture on the bottom of a baking dish. Layer 3 noodles, half of the buffalo chicken, half of the ricotta mixture, and 1 cup mozzarella and cheddar cheese. Repeat layers once more. Finish with remaining noodles and top with remaining mozzarella and cheddar cheese.

Bake:
Cover with foil and bake for 25 minutes. Remove foil and bake for an additional 10 minutes until cheese is bubbly and golden.

Garnish and Serve:
Let cool for 5 minutes before serving. Garnish with chopped green onions.