01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease.
02 - In a medium bowl, whisk together gluten-free flour, baking soda, baking powder, salt, cinnamon, nutmeg, ginger, and cloves until evenly incorporated.
03 - In a large bowl, whisk pumpkin purée, brown sugar, oil, eggs, almond milk, and vanilla extract until smooth and homogeneous.
04 - Add the dry ingredients to the wet mixture and stir gently with a spatula, blending just until batter is combined. Avoid overmixing.
05 - If desired, fold in chocolate chips, walnuts, or pecans to distribute evenly.
06 - Divide batter evenly among muffin cups, filling each approximately three-quarters full.
07 - Bake for 20 to 22 minutes, or until a toothpick inserted in the center emerges clean.
08 - Allow muffins to cool in the tin for 5 minutes, then transfer to a wire rack until fully cooled.