Preheat oven to 350 degrees. Prepare a muffin tray by lining with parchment liners (see note). In a large bowl, add flours, coconut sugar, baking powder, baking soda, salt, cinnamon or nutmeg, and chips. Stir through until well combined. In another bowl, add milk, yogurt, maple syrup, vanilla, and vinegar or lemon juice. Stir to fully combine. Add wet ingredients to dry, and mix until just combined (do not overmix). If using frozen berries, add *just* before filling muffins cups, and briefly mix through. Use an ice cream scoop to fill muffin cups, filling 11. Bake for 23 minutes, checking for doneness at this time. Remove from oven and let cool in pan for a couple of minutes. Then, transfer muffins (in paper liners) to a cooling rack to cool further.