Using a food processor with a grating disc, grate the butternut squash. You can also use a cheese grater.
Combine the shredded butternut squash, flour, eggs, garlic, sage, pepper and nutmeg in a large bowl.
Preheat oven to 250°F and place a wire rack on top of a baking sheet. Pour in about ¼ inch of oil into a large skillet and heat over medium-high heat. Scoop up ¼ cup of the butternut squash mixture per fritter and drop into skillet. Use a spatula to flatten into discs. When the edges of the fritters are brown and crispy, about 3-4 minutes, flip. Cook for another 5 minutes or until browned.
Transfer cooked fritters to a paper towel-lined rack to drain and then put on wire rack in oven to keep warm while you cook the remaining fritters. Serve immediately.
Notes
If the mixture hasn't come together, add 1 tablespoon of flour at a time to get desired consistency.
If you don't have fresh sage, use 1 teaspoon of dried sage. It is much stronger so you need to use less.
Once you add the mixture to the oil, don't move them for 4 minutes before flipping so they create a crispy exterior.
Add a dollop of goat cheese, yogurt or sour cream for additional flavor.