In a deep sauté pan on low heat, melt butter and then add in garlic and stir.

Add a quarter cup flour and mix in with butter till it becomes a thick paste.  This is called a roux.

While continuously stirring add the sour cream and goat cheese, then add pesto until it also becomes thick.

Add in the milk slowly, and continue whisking till it thickens, which will happen at boiling point.

Toss in cooked pasta and mix well.  Serve with a poached egg on top, if desired.