Preheat the oven to 350°F (175°C) and line a 12-cup muffin tin with paper liners or lightly grease it.
In a large bowl, whisk together the gluten-free flour, baking powder, baking soda, salt, cinnamon, nutmeg, and cloves.
In another bowl, mix the wet ingredients – pumpkin puree, eggs, maple syrup, melted coconut oil, and vanilla extract – until smooth.
Gradually fold the wet ingredients into the dry ingredients using a spatula. Stir until just combined. Do not overmix, or the muffins may turn dense.
If using chocolate chips, nuts, or dried fruit, gently fold them in.
Spoon the batter evenly into the prepared muffin tin, filling each cup about ¾ full.
Bake for 18-22 minutes, or until a toothpick inserted in the center comes out clean.
Let the muffins cool in the tin for 5 minutes, then transfer them to a wire rack to cool completely.