I observe my main teacher's mini lessons during the very beginning of our reader's workshop everyday, and they are super effective. Each day, she teaches the students a new strategy to help them critically think about several ideas in the book, including what they might learn, the plot, the characters' feelings, the lesson, etc. For instance, today, she taught the kids a "sneak-peak" strategy, wherein she sat in front of the classroom with the main text as the students sat across from her on the carpet. She asked the class several questions about the cover and back of the book. She guided the mini-lesson by engaging in a conversation with students that went something like this:
"Hmm I see that there is a Raccoon on the front of my non-fiction book, and the blurb on the back of my book lists different animals you can find in your backyard! So maybe this book will be about Raccoons and how they are a type of animal you can find in your backyard? Raise a quiet hand and tell me if you agree or disagree and why."
After that conversation, she told the students to look at the Table of Contents of their own non-fiction books. Each "chapter" would hint to them what they would be reading about.
She's done "sneak-peak" with fiction books as well. The strategy pulls the readers in entirely! They are really excited to use the strategy when they go back to their seats for independent reading time.