Preheat oven to 350 degrees. Grease a 2-2 1/2 qt baking dish. Boil noodles according to package directions. Rinse and drain.
In large bowl, stir together cooked noodles, cream of mushroom soup (undiluted) and peas.
Pour into greased dish. Put uncovered in oven for 20-25 minutes. Remove and drizzle melted butter over top. Sprinkle crushed potato chips evenly over the top. Return to oven and bake another 5-10 minutes until potato chips are slightly brown.