Creamy Tuna Noodle Casserole From Scratch

Preheat the oven to 375 degrees F (190 degrees C). Grease a baking dish with butter.

Bring a large pot of lightly salted water to a boil. Cook farfalle pasta at a boil, stirring occasionally, until halfway cooked, about 7 minutes. Drain and rinse under cold water. Drain again.

Stir together sour cream, cream cheese, and milk in a large bowl until smooth. Mix in tuna, green onion, and red bell pepper. Season with a little salt and pepper. Fold in cooked farfalle and pour into the prepared baking dish. Sprinkle with Gruyere cheese.

Bake in the preheated oven until cheese is melted and lightly browned, about 25 minutes.