Place grated squash in a colander and squeeze out all excess water; you should have about 1 cup grated squash.
Transfer squash to a bowl. Add onion, flour, egg, baking powder, and salt; mix well to make a batter.
Melt butter in a large skillet over medium-high heat. Drop batter into the hot pan and use the back of a large spoon to flatten fritters to 3 to 4 inches in diameter and to 1/4- to 1/8-inch thickness. Cook until edges are deep brown, about 1 minute. Flip over and cook 30 seconds more. Transfer fritters to a plate lined with a paper towel and sprinkle lightly with salt. Repeat with remaining batter, melting more butter in the pan as needed.
Serve warm topped with Cheddar cheese, onion, and sour cream.
Nutritional Facts
Per 2 servings
Calories: 391
Carbohydrate: 30g
Fat: 26g
Fiber: 6g
Protein: 15g
Sugar: 13g
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