Green Noodles aka Pesto Pasta

My friend Cheree shared this with me, and my kids loved it. Pesto is also delicious in panini.

2/3 cup packed coarsely chopped basil leaves or 2 T crushed dried basil leaves
1/3 cup grated Parmesan cheese
1/3 cup olive
2 tablespoons walnuts
1/2 teaspoon salt
1/8 teaspoon pepper
1 clove garlic
10 oz cooked spaghetti or noodles (for GF, use Tinkyada brown rice noodles)
2 tablespoons butter

Place all ingredients except pasta and butter in blender container. Cover and blend on high speed until mixture is of uniform consistency. Cook spaghetti as directed on package; drain. Toss spaghetti with basil mixture and the margarine. Serve with additional Parmesan cheese if desired.