Preheat the oven: Set it to 350°F (175°C). Line a muffin tin with liners or grease it well.
Mix dry ingredients: In a bowl, whisk flour, baking soda, baking powder, salt, cinnamon, and nutmeg until combined.
Combine wet ingredients: In another bowl, whisk melted butter, brown sugar, eggs, pumpkin puree, and vanilla until smooth.
Stir it together: Gently fold the dry ingredients into the wet mixture. Don’t overmix—no one likes dense muffins.
Add chocolate chips: Toss in the chocolate chips and stir just until combined.
Fill the muffin tin: Divide the batter evenly, filling each cup about ¾ full.
Bake: Place in the oven for 18–20 minutes or until a toothpick comes out with a few moist crumbs.
Cool & devour: Let them cool for 5 minutes before removing. Eat warm because life’s too short for cold muffins.