Preheat oven to 350 degrees. Combine flour, sugar, cinnamon, baking soda, baking powder and salt in a large bowl and set aside. Using an electric mixer whisk eggs, pumpkin, butter, milk and vanilla until smooth. Add the dry ingredients and mix until they are just blended. Grease muffin tin with coconut oil. Spoon into muffin tins (24 mini muffins or 12 standard.) bake for 15 minutes or until toothpick comes out clean. Cool completely on wire rack.