Fudge

Judy Blume (b.1938) is a popular children and preteen story author. Some of her most popular books are about a pre-teen boy named Peter Hatcher, who has a young brother named Farley Drexel Hatcher (but many people, including Peter, call him Fudge.) The Fudge books have done quite a few Muppet and Sesame Street references...

Superfudge
Fudge watches a bit of Sesame Street near the beginning of the first chapter. He then imitates Ernie and Bert's voices, first at Peter while washing his hands, and then again at the dinner table.

Then, while talking about the old stork myth (since Peter's mother is pregnant with a new baby), Fudge asks if it is like Big Bird.

While eating lunch with his new friend, Fudge mentions that he watches The Muppet Show, Sesame Street and The Electric Company. Because the book was printed in 1980, this was edited in later (post-2003) reprints of Superfudge, where Fudge now mentions that he watches Nickelodeon and Cartoon Network.

Fudge-A-Mania
Fudge imagines marrying Peter's enemy, Sheila Tubman. Fudge says that some people marry birds. Peter asks him to name one. Fudge says, "The guy who's married to Big Bird on Sesame Street." Peter says that Big Bird's not married. Fudge then says to Peter, "That's how much you know!"

Double Fudge
When Peter's long-lost relatives come to visit, his twin cousins Flora and Fauna are allowed to sleep over with Sheila Tubman, but their father (Cousin Howie) does not allow watching TV. But then the twins' mother, Cousin Eudora, suggest that maybe they could watch Sesame Street. Fudge mentions that his baby sister, Tootsie, watches Sesame Street. Then Sheila says, "We've all watched Sesame Street."