01 - Combine cinnamon, nutmeg, ginger, cloves, and allspice in a small bowl. Mix thoroughly and set aside for multiple uses throughout the recipe.
02 - In a wide, shallow bowl, blend granulated sugar with 2 teaspoons of the prepared pumpkin spice mix. Set aside for coating the warm donuts.
03 - Separate biscuit dough 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 the cut-out centers for donut holes.
04 - Pour vegetable oil into a large, heavy-bottomed pot. Heat to 350°F, maintaining steady temperature for optimal frying results.
05 - Carefully lower 3-4 donuts into the hot oil. Fry for 1-2 minutes per side until deep golden brown. Cook donut holes separately for approximately 1 minute total, turning once.
06 - Remove fried donuts using a slotted spoon. Transfer to a paper towel-lined tray to drain briefly, about 30 seconds.
07 - While donuts are still warm to the touch, immediately toss them in the spiced sugar mixture until thoroughly coated on all sides.
08 - Whisk powdered sugar, milk, vanilla extract, and 1/2 teaspoon pumpkin spice until smooth. Drizzle over cooled donuts or dip tops for added sweetness.