Step 1

Preheat oven to 375°. Line a standard 12-cup muffin pan with liners. Whisk eggs, butter, buttermilk, ginger, and ⅔ cup brown sugar in a medium bowl. Whisk flour, baking powder, baking soda, cinnamon, and salt in a large bowl. Mix egg mixture into dry ingredients with a wooden spoon or rubber spatula until just combined. Mix in squash, coconut, and pecans.

Step 2

Divide batter among muffin cups, filling to the brim (about ½ cup batter per muffin). Sprinkle remaining 2 Tbsp. brown sugar on top.

Step 3

Bake muffins, rotating pan halfway through, until golden brown and a tester inserted into the center comes out clean, 30–32 minutes. Let cool in pan 5 minutes, then transfer muffins to a wire rack and let cool completely.

Step 4

Do Ahead: Muffins can be made 3 days ahead. Store airtight at room temperature, or freeze up to 2 months.