Goat cheese and lots of fresh basil boost the flavor in this vegetarian pasta meal.
In a 5- to 6-quart Dutch oven cook pasta according to package directions; drain. Return pasta to pan; keep warm.
Meanwhile, in a large skillet, melt butter and heat 2 tablespoons olive oil over medium-high heat. Add the sweet potato. Cook for 8 minutes or until nearly tender, gently stirring occasionally. Add the onion; cook about 5 minutes more or until potato and onion are tender and lightly browned, gently stirring occasionally.
Add spinach to potato mixture, tossing gently until spinach is just wilted. Add potato mixture to pasta along with goat cheese, walnuts, basil and 2 tablespoons olive oil. Toss gently to combine. Season to taste with salt and black pepper. Serve immediately with Italian bread, if you like.