01 - Preheat oven to 400°F (200°C). Line a muffin tin with paper liners or lightly grease. Brush the cut sides of the acorn squash with olive oil. Place cut side down on a baking sheet and roast for 30-40 minutes, until tender. Let cool, then scoop out the flesh and purée until smooth. Measure 1 cup for the recipe. Reduce oven temperature to 350°F (175°C).
02 - In a large mixing bowl, whisk together flour, baking powder, baking soda, salt, cinnamon, and nutmeg.
03 - In a separate bowl, whisk together the melted butter and brown sugar until well combined. Incorporate the eggs, vanilla extract, milk, and the prepared acorn squash purée; mix until smooth.
04 - Add the wet ingredients to the dry ingredients and stir until just combined. Avoid overmixing the batter.
05 - Divide the batter evenly among the prepared muffin cups, filling each approximately three-quarters full.
06 - Bake at 350°F (175°C) for 20-25 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
07 - While the muffins are cooling, whisk together the powdered sugar, maple syrup, and enough milk to achieve a thick but pourable consistency.
08 - Once the muffins have cooled, drizzle them with the prepared maple glaze.