Preheat the oven to 325 degrees and line a muffin tin with 9 muffin liners.
Whisk the flour, baking soda, cocoa powder, cinnamon, and salt in a medium mixing bowl.
Whisk the yogurt, honey, eggs, avocado oil, milk, and vanilla extract in a large mixing bowl.
Mix the dry ingredients into the wet ingredients until just combined.
Gently fold in the peanut butter chips.
Use a large cookie scoop to divide the batter between the 9 lined muffin tin wells. Top with more peanut butter chips if you like.
Bake the muffins for 22 to 25 minutes or until a toothpick inserted into the center comes out clean.
Cool the muffins for 10 minutes in the pan. Then, transfer them to a wire rack to cool completely.