This Potato Candy recipe is a fascinating example of starch-sugar hygroscopy and laminar suspension. By utilizing the high starch content of plain mashed potatoes as a moisture binder, you can incorporate an massive volume of powdered sugar (sucrose) into a stable, malleable dough. The potatoes act as a “liquid-phase” facilitator without the need for traditional dairy fats, creating a unique texture that is flexible enough to roll into a pinwheel spiral with creamy peanut butter without cracking.

 

Potato Candy Pinwheels – Ingredients

• 1/4 cup plain mashed potatoes, cold
• 4 cups powdered sugar
• 1/2 cup creamy peanut butter

 

Step-by-Step Directions:

Step 1: The Starch-Sugar Matrix: In a medium bowl, combine the cold potatoes and powdered sugar 1 cup at a time.

Tip: Using plain, cold potatoes is a vital mechanical step. If the potatoes contain any butter or milk, or if they are even slightly warm, the starch molecules will not be able to “trap” the sugar effectively. This would lead to a runny, sticky mess rather than the “Play-Doh” consistency required for rolling.

Step 2: The Laminar Roll: Dust your surface with powdered sugar and roll the dough into a 12×8-inch rectangle, roughly 1/4-inch thick.

Note: The dough should feel smooth and non-tacky. If it sticks to your rolling pin, the sucrose-to-starch ratio is too low—simply dust with more sugar until the dough moves freely.

Step 3: The Lipid Spread: Warm the peanut butter for 10 seconds and spread it evenly, leaving a 1/2-inch border on one long edge.

Tip: Leaving a border is a structural necessity. As you roll the dough into a log, the peanut butter is displaced outward. Without the border, the filling would squeeze out of the ends, preventing a clean “seal” on the outer edge of the pinwheel.

Step 4: The Spiral Roll: Roll the dough tightly into a log starting from the long edge.

Step 5: The Thermal Set: Wrap the log and refrigerate for at least 1 hour (or freeze for 30 minutes) before slicing.

 

Tip: This chill is a “viscosity” necessity. Potato candy is highly temperature-sensitive. If you slice it while at room temperature, the pressure of the knife will flatten the spiral. Chilling firms the peanut butter and “locks” the sugar crystals, allowing for clean, sharp pinwheel slices.