Brown Butter Sauce with Cranberries

1/2 cup butter
1/2 cup chopped walnuts
1/2 cup dried cranberries
3 tbsp. fresh sage
A pinch of red pepper flakes (optional)
Salt and pepper to taste
Parmesan cheese

Cook pasta until al dente. Remove from heat, drain and set aside. Melt butter in a sauce pan over medium heat. Add the walnuts, cranberries, sage and red pepper flakes. Cook until butter starts to brown, but not burn, about 3 minutes. Salt and pepper to taste and toss with pasta. Top with parmesan and serve.