Churro Mini Muffins

• Cooking spray

• 3 cups

  all-purpose flour

• 2 tsp.

  baking powder

• 1/2 tsp.

  kosher salt

• 1/2 cup

  packed brown sugar

• 1/2 cup

  granulated sugar

• 1 tsp.

  ground cinnamon

• 1/2 cup

  (1 stick) melted butter

• 2

  eggs, lightly beaten

• 1 cup

  milk

For the cinnamon sugar coating

• 4 Tbsp.

  melted butter

• 1/2

  granulated sugar

• 2 tsp.

  ground cinnamon