Preheat oven to 350
In small bowl, beat eggs. Spoon 1-2 tbs. of eggs into small bowl or cup (reserve for later)
In medium bowl mix flour, sugar, baking powder, salt, and cinnamon until combined.
Cut in butter using pastry tool or two knives
Add cherries, pistachios, vanilla, and eggs (do not include the 2 tablespoons you reserved) and mix until combined
Turn mixture onto counter, and press dough together to form a ball
Slice ball into four equal sections
Using your hands, form each section into a log, about 9 x 2 inches. Use flour on your hands as you work the dough (You can change the size, but expect a different amount of cut biscotti)
Place two logs on one sheet pan. (Repeat process for final two logs)
Brush the top of each log with the reserved egg
Bake logs for 25 minutes. Let cool
Using serrated knife, cut logs into 1/2 inch slices. Place cut biscotti pieces on their sides on baking sheets.
Bake slices 15 minutes (for even baking, rotate cookie sheets half way through cooking)
Cool biscotti on wire racks (they will harden as they cool)