Preheat the oven to 375 degrees F (190 degrees C). Grease a 12-cup jumbo muffin pan or line cups with paper liners.
Mix flour, brown sugar, wheat germ, 1/4 cup flax seeds, baking powder, salt, cinnamon, ginger, and baking soda together in a large bowl.
Mix butternut squash, melted butter, buttermilk, eggs, water, and vanilla together in a separate bowl. Add to the dry ingredients and stir until moistened. Scoop into the prepared muffin pan and sprinkle with remaining flax seeds.
Bake in the preheated oven until a toothpick inserted in the centers comes out clean, about 25 minutes. Cool in the tin briefly before transferring to a wire rack to cool completely.
Nutritional Facts
Per 12 servings
Calories: 375
Carbohydrate: 46g
Fat: 19g
Fiber: 3g
Protein: 8g
Sugar: 15g
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