Preheat the oven to 400 degrees, prep muffin trays with liners, and set aside.
Mix the flour, baking powder, baking soda, salt, cranberries, and coconut in a bowl and set side.
In a stand mixer, or in a separate bowl with a whisk, add the sugars, vanilla extract, avocado oil, sourdough starter, milk, and eggs. Mix together well.
If you are using a stand mixer, keep mixing the wet ingredients on a lower setting and gradually add the dry ingredients until well incorporated.
If you are whisking everything together, add the ingredients in a little bit at a time and whisk until everything is just incorporated.
Once everything is mixed, use a medium sized cookie scoop to fill in your muffin tins. We have tins to make small muffins and our cookie scoop is about 2 tablespoons. Don't forget, fill them to the top!
Finally, add extra cranberries and shredded coconut to the top and bake at 400 degrees for 13 - 14 minutes.