Whole Wheat Chocolate Chip Banana Peanut Butter Muffins

Bahan-bahan (18 porsi)

• 6 tablespoons soft butter
• 1/3 cup sugar
• ½ teaspoon vanilla
• 2 tablespoons peanut butter
• 6 small (Filipino!) or 3 large bananas, mashed
• 3 eggs
• ¾ cup buttermilk
• 2 ¼ cup whole wheat flour
• 1/4 cup quick cooking oats (see notes)
• 2 ½ teaspoons baking soda
• pinch of cinnamon
• 3/4 cup chocolate chips
• 4 tablespoons butter, chilled
• 1 tablespoon water
• ¾ cup whole wheat flour
• ¾ cup sugar
• pinch of cinnamon