Preheat the oven to 350 degrees then coat a muffin pan with cooking spray - I used coconut oil spray.
Combine the flour, cinnamon, baking soda, and salt in a small bowl; mix well.
In another large bowl, using a hand mixer beat the coconut oil, sugar, banana, and vanilla until creamy.
Add the eggs, one at a time, then continue beating until well combined.
Add the flour mixture to the banana mixture and stir until just combined. Add the 1/2 cup of peaches then gently mix them into the batter.
Spoon the batter evenly into each muffin tin.
Add a couple of fresh blackberries to each muffin, pushing them in gently.
Evenly sprinkle the remaining 1/4 cup of peaches on the tops of each muffin.
Place into the oven and bake for 23-25 minutes or until a tester inserted into the center comes out clean. Let the muffins cool on a rack. Slather with butter and enjoy!