Preheat the oven to 375F. Line a 6 jumbo muffin pan or a 12 regular sized muffin pan and set aside.
In a large bowl, whisk together the dry ingredients; flour, baking powder, cinnamon, salt.
In a separate bowl, add the wet ingredients; mashed bananas, melted and cooled coconut oil, honey, eggs, vanilla extract, yogurt, milk. Whisk until well combined.
Add the wet to the dry ingredients, folding until fully incorporated.
Add the chocolate chips and chopped walnuts.
Divide the batter evenly into muffin tin, sprinkle mini chocolate chips on top if desired.
Bake for 22-25 minutes for small, 25-30 for jumbo, until golden.
Cool in a cooling rack. Best when served warm. Recipe makes 16 regular sizes muffins and 9 jumbo.