Preheat the oven to 350F. Line two muffin pans with liners and set aside.

In a large mixing bowl, mash the bananas. Add the brown sugar, oil, vanilla, and almond milk, and whisk to incorporate.

Add in the flour, baking soda, salt, and cinnamon, and use a spoon to mix. Finally, stir in the chocolate chips.

Using a large spoon, divide the batter evenly among 15 muffins. Top each with a slice of banana.

Bake for 16-18 minutes, until a toothpick inserted in the center comes out with just a few crumbs.