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Preheat the oven to 350 degrees.
Melt butter in a microwave safe dish, in a saucepan, or small cast iron pan.
Lightly grease a muffin tin or line with cupcake liners.
In a stand mixer with a paddle attachment or a bowl, mix together melted butter and brown sugar for five minutes.
Turn off the mixer and add in eggs, vanilla, mashed banana, and sourdough starter.
In a separate bowl, stir together dry ingredients (flour, baking soda, baking powder, and salt) well.
Add in dry ingredients ⅓ at a time and mix until just incorporated. You don’t want to over-mix.
Add equal amounts of batter to each muffin well. I like to use an ice cream scoop for this.
Top each muffin with the oat crumble.
Bake for 20-25 minutes or until a toothpick or cake tester comes out clean.
Allow the muffins to cool completely. Enjoy