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To prepare the streusel, combine brown sugar, all-purpose flour, cinnamon, and salt in a bowl. Cut the butter into small cubes and mix it into the dry ingredients until you achieve a crumbly texture. Place the streusel mixture in the refrigerator until you need it.
In a separate bowl, mash the bananas. Then, add the melted butter, sugar, brown sugar, avocado oil, eggs, vanilla extract, and sour cream to the mashed bananas, mixing everything together thoroughly.
In another bowl, whisk together the all-purpose flour, baking powder, baking soda, salt, and cinnamon.
Gently fold the dry ingredients into the wet mixture until just combined.
Line a muffin tin with cupcake liners and fill each liner halfway with the batter. Sprinkle a layer of the streusel mixture on top, then add more batter, and finish with another layer of streusel, pressing it gently into the batter.
Bake the muffins in a preheated oven at 400 degrees Fahrenheit for 5 minutes. After that, lower the temperature to 350 degrees Fahrenheit and continue baking for an additional 15 minutes, or until the centers are set.