Banana Speculoos Cupcakes

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Brown Butter Crumble:

4 tablespoons unsalted butter

1/2 cup all-purpose flour

1/2 cup brown sugar

1/4 teaspoon salt

Pinch ground cinnamon

Cupcakes:

1 1/4 cups all-purpose flour 

1 teaspoon baking powder 

1 teaspoon baking soda

1 teaspoon salt

2 sticks unsalted butter, at room temperature

1 1/2 cups brown sugar

1 1/2 cups mashed bananas (very ripe) 

3/4 cup sour cream

1/2 teaspoon vanilla extract

2 whole eggs, at room temperature

Speculoos Buttercream:

1 cup speculoos cookie butter, at room temperature

4 tablespoons unsalted butter, at room temperature

1/2 cup powdered sugar