Follow these step-by-step instructions to create a delectable Ranch Ham and Noodle Casserole:

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C) to ensure it’s ready when you assemble the casserole.
2. Cook the Noodles: In a large pot of salted boiling water, cook the egg noodles according to the package instructions until al dente. Drain and set aside.
3. Prepare the Sauce: In a large mixing bowl, combine the condensed cream of mushroom soup, sour cream, milk, and ranch seasoning mix. Stir until smooth and well combined.
4. Mix in Ingredients: Add the cooked ham, shredded cheddar cheese, frozen peas, and chopped green onions to the sauce. Stir gently to incorporate all the ingredients.
5. Combine with Noodles: Gently fold the cooked noodles into the ham and sauce mixture until evenly coated.
6. Transfer to Baking Dish: Grease a 9×13-inch baking dish with butter. Pour the noodle mixture into the dish, spreading it out evenly.
7. Add Topping: For a crunchy topping, sprinkle the crushed Ritz crackers evenly over the casserole.
8. Bake: Place the casserole in the preheated oven and bake for 25-30 minutes, or until the top is golden brown and the sauce is bubbly around the edges.
9. Serve: Remove from the oven and let the casserole cool for a few minutes before serving.