Gather all ingredients. Preheat the oven to 375 degrees F (190 degrees C). Line 2 large rimmed baking sheets with parchment paper; set aside.

Roll premade pie crust to 1/8-inch thickness on a lightly floured work surface, and cut using desired cookie cutter shapes.

Transfer cut-outs to prepared baking sheets, leaving about a 1/2-inch space between each cookie. Repeat with remaining dough, rerolling scraps once.

Whisk together egg and milk in a small bowl until combined. Using a pastry brush, brush the tops of each cookie evenly with egg mixture; discard remaining egg mixture. Whisk together sugar, cinnamon, and salt in a small bowl until evenly combined, sprinkle evenly over brushed cookies.

Bake cookies, one baking sheet at a time, in the preheated oven until the edges and bottoms of cookies just become golden brown, about 15 minutes.