Preheat & Prep Pan: Preheat oven to 350°F (175°C). Line a muffin tin with liners or lightly grease the cups.
Mix Dry Ingredients: In a medium bowl, whisk together flour, baking soda, baking powder, cinnamon, nutmeg, and a pinch of salt.
Mix Wet Ingredients: In a separate bowl, whisk together egg, pumpkin purée, brown sugar (or maple syrup), oil or melted butter, and vanilla extract.
Combine Wet & Dry: Add dry ingredients to the wet mixture. Stir gently until just combined—do not overmix.
Add Blueberries: Gently fold in blueberries. (If using fresh, toss them in a little flour first to prevent sinking.)
Fill & Bake: Divide batter evenly among the muffin cups. Bake at 350°F for 20–22 minutes, or until a toothpick inserted into the center comes out clean. Let cool slightly before serving.
Serve the muffins with fruit and milk. Enjoy!