Preheat the oven to 350 degrees, then coat a muffin pan with cooking spray.

In a large bowl, beat the butter and sugar with a hand mixer until creamy.

Add the eggs, bananas, and vanilla, then continue beating until well combined.

In a separate bowl, combine the flour, cocoa, baking soda, and salt and mix well.

Add the flour mixture to the banana mixture and stir until just combined.

Add the 3/4 cup of white chocolate chips, then gently mix them into the batter.

Spoon the batter evenly into each muffin tin.

Add the last 1/4 cup of the remaining white chocolate chips equally to each muffin, pushing them in gently.

Place into the oven and bake 22-25 minutes or until a tester inserted into the center comes out clean.

Let the muffins cool on a wire cooling rack.

Slather with butter, if desired, and enjoy!