If you have muffins left over, you can use this tip to give them new life.
Preheat the oven to 325F. Cut up each muffin into 4~6 thin pieces and place in a baking pan covered with a baking sheet. Bake each side for 10~12 minutes (flipping once), then cool as necessary.
Since each muffin yields 4~6 biscotti, you can take about 3 of them as a portion-controlled snack. And on top of that the muffins won't go to waste--an excellent use of resources.
I got this idea from Baking Bites: