Banana Crumb Muffins

Step 1
Preheat the oven to 375 degrees F (190 degrees C). Lightly grease or line 10 muffin cups with paper liners.

Step 2
Prepare muffins: Mix flour, baking soda, baking powder, and salt together in a large bowl.

Step 3
Beat bananas, white sugar, melted butter, and egg together in a separate bowl; stir the banana mixture into the flour mixture just until combined. Spoon batter into prepared muffin cups, filling each about 3/4 full.

Step 4
Prepare crumb topping: Mix brown sugar, flour, and cinnamon together in a small bowl. Use a fork to mix in 1 tablespoon butter until mixture is crumbly; sprinkle topping over muffins.

Step 5
Bake in the preheated oven until a toothpick inserted into the center comes out clean, 18 to 20 minutes.