To dry a pumpkin, wash it, and cut it in half lengthwise. Remove all the pulp, fibers and seeds from each half using a scooper. Cut the pumpkin halves into 1- to 2-inch cubes. Bring a gallon of water to a boil, and submerge the cubes in the boiling water.
Boil the cubes for one minute. Remove them with a slotted spoon, and place them in a bowl of ice water to cool for about one minute. Repeat the process until all the cubes have been boiled.
Using a sharp knife, remove the skin from the cubes, and discard it. Cut the cubes into smaller 1/4-inch slices. Using a single-layer baking sheet, spread the cubes out, and place them in a pre-heated oven set to 140 to 150 degrees Fahrenheit. Open the oven door slightly during drying to enable excess moisture to escape. Dry the pumpkin slices for 10 to 16 hours or until they are brittle and dry, checking them periodically to ensure that the edges don’t scorch.
You can also dry the pumpkin slices using an electric dehydrator by spreading them on a tray that has been lined with parchment paper. Set the temperature to 140 degrees Fahrenheit, and dehydrate them overnight. Once the pumpkin has cooled, you can process it into a powder using a blender such as a VItamix or a spice grinder. Let the powder settle, and store it in an airtight container. Adding a teaspoon of the pumpkin powder to recipes such as soup, mashed sweet potatoes or squash imparts a seasonal flavor and provides extra nutrients.