Preheat oven to 350°F. Grease an 8x8-inch baking dish.

In a small sauté pan, cook onion in olive oil over medium-high heat until translucent, about 5 minutes.

In a large bowl, combine onion with noodles, tuna, cheese, sour cream, dry mustard, and paprika. Stir well to mix everything together.

Transfer to prepared baking dish and bake 25 to 30 minutes or until heated through and top is lightly browned. Serve with potato chips.