1.Bring A Large Pot Of Lightly Salted Water To A Boil. Add Pasta And Cook For 8 To 10 Minutes Or Until Al Dente; Drain. 2.In A Saucepan Over Medium Heat, Combine Cheddar Cheese, Milk, Butter, Cottage Cheese, And Sour Cream; Stir Until Melted. 3.Pour Cooked Noodles Into The Cheese Mixture And Stir Until Well Mixed. Stir In Canned Tuna And Green Peas; Heat Thoroughly.