Chocolate chip banana crumb muffins

So I've been collecting ripe bananas and decided to make some banana muffins a while back. I'm awake and not distracted by Korean drama and decide I need to bake... Here is the result. I found the recipe on allrecipes.com and decided to adapt it just a bit. 

Ingredients

• 1 1/2 cups all-purpose flour
• 1 teaspoon baking soda
• 1 teaspoon baking powder
• 1/2 teaspoon salt
• 3 bananas, mashed
• 3/4 cup white sugar
• 1 egg, lightly beaten
• 1/3 cup butter, melted
  • 1/3 cup packed brown sugar
  • 2 tablespoons all-purpose flour
  • 1/8 teaspoon ground cinnamon
  • 1 tablespoon butter
    Directions
    1. Preheat oven to 375 degrees F (190 degrees C). Lightly grease 10 muffin cups, or line with muffin papers.
    2. In a large bowl, mix together 1 1/2 cups flour, baking soda, baking powder and salt. In another bowl, beat together bananas, sugar, egg and melted butter. Stir the banana mixture into the flour mixture just until moistened. Mix in 1/3 cup of chocolate chips. Spoon batter into prepared muffin cups.
    1. In a small bowl, mix together brown sugar, 2 tablespoons flour and cinnamon. Cut in 1 tablespoon butter until mixture resembles coarse cornmeal. Sprinkle topping over muffins.
    2. Bake in preheated oven for 18 to 20 minutes, until a toothpick inserted into center of a muffin comes out clean.