01 - Combine ground cinnamon, nutmeg, ginger, cloves, and allspice in a small bowl. Mix thoroughly and set aside for later use.
02 - In a wide, shallow bowl, mix granulated sugar with 2 teaspoons of the prepared pumpkin spice blend until evenly distributed.
03 - Separate refrigerated biscuits into individual pieces. Using a 1-inch round cutter or bottle cap, press through the center of each biscuit to create a donut shape. Reserve removed centers for donut holes.
04 - Pour vegetable oil into a large, heavy-bottomed pot. Heat to 350°F, maintaining temperature throughout frying process.
05 - Carefully lower 3-4 donuts into hot oil. Fry for 1-2 minutes per side until deep golden brown. Fry donut holes separately for approximately 1 minute total.
06 - Remove fried donuts using a slotted spoon. Transfer to paper towel-lined tray to drain briefly while still warm.
07 - Immediately toss warm donuts in spiced sugar mixture, pressing gently to ensure thorough coating on all sides.
08 - Whisk powdered sugar, milk, vanilla extract, and remaining pumpkin spice until smooth. Drizzle over cooled donuts or dip tops for extra sweetness.