These icebox cookies are delicious, buttery, and tender. The dough is easy to make with simple ingredients ready to freeze or refrigerate and bake anytime!
Whisk flour, baking soda, and cinnamon together in a large bowl until evenly blended; set aside.
Beat butter, white sugar, and brown sugar in a separate large bowl with an electric mixer until smooth. Add eggs one at a time, allowing each egg to blend into butter mixture before adding the next. Mix in flour mixture until just incorporated. Fold in chopped nuts; mixing just enough to evenly combine.
Scrape cookie dough onto a sheet of waxed paper, and form into a log. Roll tightly in the waxed paper, and refrigerate until firm, about 4 hours.
Preheat the oven to 350 degrees F (175 degrees C). Spray baking sheets with cooking spray.
Unwrap the dough, and cut into 1/4-inch slices. Place cookies onto baking sheets, spaced 1-inch apart. Bake in the preheated oven until the edges are golden, 8 to 10 minutes. Allow the cookies to cool on the baking sheet for 1 minute before removing to a wire rack to cool completely.