Brown Sugar Banana-Clementine Muffins

For the topping:

• ⅓ cup brown sugar
• ⅓ cup granulated sugar
• 1 cup all-purpose flour
• ½ cup chopped walnuts
• 1 teaspoon cinnamon
• ½ teaspoon cloves
• ¼ teaspoon salt if using unsalted butter
• 5 tablespoons butter melted

For the muffin batter:

• 2 ¾ cups all purpose flour
• 2 ½ teaspoons baking powder
• ½ teaspoon baking soda
• ¼ teaspoon salt
• 2 tablespoons clementine zest
• ½ cup Canola or other mild flavored oil
• 1 ⅓ cups packed brown sugar
• 1 large egg
• 1 cup buttermilk
• 2 teaspoon vanilla extract
• 1 large banana not overly ripe, diced into ¼ inch pieces

For the glaze:

• 1 ¼ cup confectioners' sugar
• 3 tablespoons clementine juice