First, make the applesauce. Combine all ingredients in a medium stock pot and bring to a boil. Lower to a simmer and simmer until apples and soft and cranberries pop, about 15 minutes. Process with an immersion blender or food processor until smooth. Cool.
Next, time to make the latkes. Pre-heat oven to 200 degrees F. Set aside paper towels for draining.
In a large bowl, whisk together water and cornstarch until combined. Shred latkes into water mixture and toss to coat. This will help crisp up latkes. Let sit for a few minutes. Then remove the sweet potatoes and drain the water careful not to discard white starch on the bottom. This will help crisp up your latkes even more.
Dry with towels as much as possible to remove moisture.
Add in remaining starch, eggs, flour, and salt to sweet potatoes and combine.
Heat a large sauté pan over medium high heat and add oil. You want oil hot enough that the latke batter sizzles when placed in the oil but doesn’t brown immediately. Place ¼ cup dollops of latke batter into oil, careful not to crowd the pan. Fry one side until well browned, about 3-5 minutes. Then flip and fry the other side. Drain on paper towels.
Keep latkes warm in the oven and repeat with remaining batter.