4 tablespoons (1/2 stick) butter, room temperature
For the muffins!
1 ½ cups flour
1 teaspoon baking soda
1 teaspoon baking powder
3 ripe bananas, mashed
1/2 cup sugar
1 egg, beaten
⅓ cup melted butter
1 /2 teaspoon vanilla
Instructions
Preheat your oven to 375 and spray a 12-cup muffin tin with cooking spray.
First up, make the topping! Put ½ cup of flour, ¼ cup brown sugar, a teaspoon of cinnamon, ¼ cup of chopped walnuts and 4 tablespoons of room temperature butter in a medium bowl and mix it up – I find this easiest to do with my fingers. Set it aside.
Now for the muffin batter! Put 1 ½ cups of flour and a teaspoon each of baking soda and baking powder in a mixing bowl and stir gently with a whisk until they are mixed together.
Put 3 mashed ripe bananas, a half cup of sugar, a beaten egg, 1/3 cup of melted butter and a teaspoon of vanilla in another bowl and stir it all up until it’s nice and combined.
Add the flour mixture to the banana mixture and stir until everything is mixed together.
Divide the muffin batter between the 12 muffin cups (they should be not quite full) and then top with the crumble topping.
Pop it in the oven for 15 to 20 minutes – a toothpick inserted into the center of a muffin should come out clean.
Let your muffins rest for 10 to 15 minutes and then carefully take them out and put them on a cooling rack. At this point it is a-okay (and actually kinda mandatory) to eat one while they are still warm!
Notes
Bananas: You want nice ripe ones so that they smoosh up easily.
Walnuts: These are totally optional, and you can also sub in different nuts if you like!
Baking Powder and Baking Soda: You want to make sure both of these are fresh – they are the ingredients that make your muffins fluffy! I always check the expiration date on mine before using them.